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50results about How to "Reduce industrial costs" patented technology

A method for making MEMS switch, and MEM device and its making method

A method for pseudo-planarization of an electromechanical device and for forming a durable metal contact on the electromechanical device and devices formed by the method are presented. Two principal aspects of the method include the formation of a planarized dielectric / conductor layer on a substrate and the formation of an electrode in an armature of a microelectromechanical switch, with the electrode formed such that it interlocks a structural layer of the armature to ensure it remains fixed to the armature over a large number of cycles. The present invention also relates to a system and method for making MEM switches having a common ground plane. One method for making MEM switches includes: patterning a common ground plane layer on a substrate; forming a dielectric layer on the common ground plane layer; depositing a DC electrode region through the dielectric layer to contact the common ground plane layer; and depositing a conducting layer on the DC electrode region so that regions of the conducting layer contact the DC electrode region, so that the common ground plane layer provides a common ground for the regions of the conducting layer.
Owner:周嘉兴

Three-dimensional net-like aluminum porous body, electrode using the aluminum porous body, nonaqueous electrolyte battery using the electrode, and nonaqueous electrolyte capacitor using the electrode

Provided are a three-dimensional net-like aluminum porous body in which the diameter of cells in the porous body is uneven in the thickness direction of the porous body; a current collector and an electrode each using the aluminum porous body; and methods for producing these members. The porous body is a three-dimensional net-like aluminum porous body in a sheet form, for a current collector, in which the diameter of cells in the porous body is uneven in the thickness direction of the porous body. When a cross section in the thickness direction of the three-dimensional net-like aluminum porous body is divided into three regions of a region 1, a region 2 and a region 3 in this order, the average cell diameter of the regions 1 and 3 is preferably different from the cell diameter of the region 2.
Owner:SUMITOMO ELECTRIC IND LTD +1

Electric heater for air conditioner of automobile

The invention provides an electric heater for an air conditioner of an automobile and belongs to the indoor heating equipment of an automobile, in particular to an electric heating device arranged in an air conditioner of an automobile. The electric heating device comprises a heating core body electrically powered by an electrode component, wherein the heating core body is formed by the superposition of a heating component and a heat dissipation component; the heating core body is provided with a core body protection plate component consisting of a first core body protection plate arranged onone side of the heating core body and a second core body protection plate arranged on the other side of the heating core body; a tight spring clamp is arranged on the end part of the heating core body provided with the core body protection plate component; a lower bracket is arranged on one side of the heating core body, an upper bracket is arranged on the other side of the heating core body, andthe lower bracket is provided with a lower bracket mould cavity adopting a mould cavity structure capable of accommodating the corresponding end part of the heating core body clamped by the core bodyprotection plate component; and the upper bracket is provided with an internal mould hole which is matched with the corresponding end part of the heating core body clamped by the core body protectionplate component. The electric heating device has the advantages of simple assembly process, safety and reliability and effective improvement of heating efficiency of the heater.
Owner:TIANJIN SANDEN AUTO AIR CONDITIONING

Logistics application-oriented universal industry service bus system and implement method thereof

InactiveCN101986614ABreak through the performance bottleneck of the loadAvoid single point of failureBus networksLogistics managementEmbedded system
The invention discloses a logistics application-oriented universal industry service bus system. The system comprises a service requester, a service supplier, a safety center, an application adapter, a service adapter, an industry bus, a bus adapter and a global bus. The invention also discloses an implement method of the logistics application-oriented universal industry service bus system. The implement method comprises the following steps of: 1, receiving request information by using the industry bus, judging whether the service supplier is on the industry bus or not, if the service supplier is not on the industry bus, entering a step 2, and if the service supplier is on the industry bus, entering a step 3; 2, sending the request information to the global bus through the bus adapter by using the industry bus, sending the request information to the corresponding industry bus by using the global bus, and entering the step 3; and 3, sending the request information to the service supplier by using the industry bus, waiting for result information returning, and returning the result information according to the original path. The system of the invention has the advantages of convenience of integration and interaction, wide application range, high safety, high shielding property and the like.
Owner:SOUTH CHINA UNIV OF TECH

Chrysanthemum flower picking device

The invention discloses a chrysanthemum flower picking device. The chrysanthemum flower picking device comprises a picking head, a conveying tube, a storage box and a fan, wherein the tail part of the picking head is connected with the conveying tube; the conveying tube communicates with the storage box; and fan is arranged on the storage box. According to the chrysanthemum flower picking device disclosed by the invention, chrysanthemum flowers are picked by the picking head, and negative pressure, formed in the storage box by the fan, is used for inputting the chrysanthemum flowers into the storage box through the conveying tube; a handle is arranged on the picking head, so that operation of a picking worker is convenient; the storage box is set to be a carrier type rubber frame, is light and convenient to carry, so that picking staff carries the storage box on the back while operating the picking head, and therefore, the chrysanthemum flower picking device can complete picking of the chrysanthemum flowers, and is convenient and labor-saving; a comb fork of the picking head is driven by a motor to rotate, so that the speed is high and the efficiency is high; one picking head can replace workload of several persons, so that investment on chrysanthemum flower picking is reduced; and the chrysanthemum flower picking device is simple in structure, is convenient to use, greatly improves chrysanthemum flower picking efficiency and reduces industrial cost.
Owner:蒋仕飞 +4

Device for collecting chrysanthemums in batches

The invention discloses a device for collecting chrysanthemums in batches. The device comprises a walking and conveying device, a driving system and a collection executing device. The collection execution device is arranged in the front of the walking and conveying device, and the driving system is arranged on the walking and conveying device and connected with the walking and conveying device and the collection executing device in a driving mode; the collection executing device comprises a rotary shaft, a comb knife, a pressing plate and a supporting plate, the supporting plate is arranged on the rotary shaft, the comb knife is arranged on the supporting plate, the pressing plate is arranged on the comb knife, the pressing plate and the supporting plate are connected in an opposite pressing mode to fix the comb knife, the rotary shaft is connected with the driving system, and the two ends of the rotary shaft are connected to the walking and conveying device through connecting rods. Electric-energy driving is adopted for the device and replaces manual picking, and in this way, the labor intensity of workers is lowered; the efficiency of chrysanthemum picking is greatly improved, investment input into collection of the chrysanthemums is lowered, and the device is simple in structure and convenient to use and lowers industry cost.
Owner:蒋仕飞 +4

Polymer microgel oil-displacing agent, preparing method thereof and applications thereof

ActiveCN104017131AHas long-term stabilityFlexibleDrilling compositionSalt resistancePolymer science
The invention relates to the technical field of petroleum recovery efficiency increasing, profile control, flooding, water plugging, and other production increasing fields in oilfield development, and discloses a polymer microgel oil-displacing agent, a preparing method thereof and applications thereof. By adopting a water soluble hydroxy-containing monomer and / or a water soluble hydroxy-containing polymer as the main molecule and by adopting an acrylamide monomer as an auxiliary molecule, the polymer microgel oil-displacing agent is prepared by one-step in-situ crosslinking through an inverse emulsion polymerization method. The preparing process is simple. The prepared polymer microgel oil-displacing agent has characteristics of hydration swelling, elastic deformation, high-temperature resistance, and high-salt resistance, and can be used in an oilfield having a temperature of 20-160 DEG C.
Owner:中国石油勘探开发研究院采油工程研究所 +1

Pure-grain solid-state liquor brewing process

The invention discloses a process which adopts non glutinous sorghum and waxy wheat as materials to brew pure-grain solid-state liquid and solves the technical problems that the high-quality liquor cannot be obtained by adopting the non glutinous sorghum as the materials through the pure-grain solid-state brewing process in the prior art. In the method, the mixture of the non glutinous sorghum and the waxy wheat is used as the grain materials, the raw material ratio of the grain materials is controlled and the dosage of loosening agent is adjusted in a fermentation process, so that the defects of spicy taste and heavy odor of the liquor brewed by the non glutinous sorghum are solved. The brewing process is further optimized from condition controls based on the method, wherein the condition controls mainly comprise material preparing condition control, grain brewing condition control, saccharifying condition control and fermenting condition control, so that the scientific metering problems of the key process conditions such as the grain brewing time, the saccharifying time, the fermenting time and the like are in particular solved. The method provided by the invention can save the consumption of the glutinous sorghum in the pure-grain solid-state liquor brewing, and ensures the quality of the produced liquor while greatly reducing the material cost of the liquor brewing. Moreover, the method has no special requirements on conventional liquor brewing devices including the fermentation pits.
Owner:CHENGDU INST OF BIOLOGY CHINESE ACAD OF S

Cell culture substrate, and method for manufacturing same

A cell culture substrate is used comprising a photopolymerization initiator immobilized on a surface of the cell culture substrate, and a linear polymer immobilized on a part or the entirety of the surface via the photopolymerization initiator, and wherein the photopolymerization initiator is thioxanthone. Thereby, advantageously, a single type or multiple types of cells are efficiently cultured on specific regions of the culture substrate, and efficiently detached only by changing temperature on the surface of the substrate.
Owner:TOKYO WOMENS MEDICAL UNIV

Printed circuit board processing method, system and copper foil for processing

The present invention provides a printed circuit board processing method, which includes the following steps: S1, laser cutting: using laser to cut out a circuit needed on the copper foil which is pasted on the carrier; S2, preferential viscosity processing: carrying out preferential viscosity processing to the copper foil and the carrier; S3, preferential adsorption: carrying out preferential adsorption to the cut copper foil corresponding to the non-circuit part; S4, peeling: peeling the non-circuit part of copper foil off the carrier to obtain the copper foil corresponding to the circuit part attached to the carrier; S5, preparation of the printed circuit board, transferring the copper foil of the circuit part on the carrier to the baseboard to obtain the printed circuit board. It is possible to use laser cutting to cut the printed circuit board, avoid chemical milling in the manufacture process, and directly recycle the waste copper, is of great value of environmental protection while reducing the cost, and a new thought for preparing printed circuit board with copper foil is provided.
Owner:北京启创驿讯科技有限公司

Industrial robot

An industrial robot may include a main body part; a plurality of levers having base end sides turnably connected with the main body part; a plurality of arm parts having respective base end sides turnably connected with respective tip end sides of the plurality of the levers; a movable part which is turnably connected with the respective tip end sides of the plurality of the arm parts; and a plurality of turning drive mechanisms for respectively turning the plurality of the levers. The plurality of the levers may radially extend to an outer peripheral side of the main body part at a substantially equal pitch. The arm part may provided with two arms which are mutually parallel to each other and are formed in a straight shape;
Owner:SANKYO SEIKI MFG CO LTD

Preparation method of printed circuit board and copper foil for processing

The invention provides a preparation method of a printed circuit board. The method includes the following steps of: S1, copper foil arrangement: copper foil is arranged on a carrier in a manner that the copper foil is aligned with the carrier, and the copper foil and the carrier are composited; S2, laser cutting: laser cutting is performed on the pattern of the circuit diagram of a circuit board;S3, selective peeling: an aluminum substrate is coated with photoresist, and a mask with a circuit diagram is arranged on the aluminum substrate, and the aluminum substrate is selectively exposed according to the pattern of the circuit diagram, so that the non-circuit portion of the circuit diagram loses viscosity; and S4, printed circuit board preparation: the copper foil arranged on the carrieris aligned with the aluminum substrate, so that the circuit diagrams of the copper foil and the aluminum substrate are completely overlapped with each other, and the copper foil of a circuit portion is completely bonded to the aluminum substrate, and the copper foil of a non-circuit portion is peeled off. According to the preparation method of the invention, the circuit board is inscribed by a laser cutting method, so that chemical etching can be avoided in a production process; and waste copper can be directly recycled, and therefore, a great environmental protection value can be realized with cost reduced. With the method adopted, a new idea is provided for the production of copper foil for circuit board.
Owner:北京启创驿讯科技有限公司

Induction and extraction separation method of marine organism-sourced high-efficiency heavy metal removing agent shellfish metallothionein

The invention discloses an induction and extraction separation method of marine organism-sourced high-efficiency heavy metal removing agent shellfish metallothionein. The induction and extraction separation method comprises following steps: (1) a selected bivalve mollusk is subjected to 2 to 7 days of temporary rearing in clean seawater, and dead ones are removed; (2) directional induction is carried out; (3) shells are open so as to collect shellfish meat, a buffer solution is added at a certain ratio, and an obtained extracted solution is subjected to thermal treatment so as to remove impurity protein; (4) the extracted solution is cooled, and is delivered through a screen so as to remove precipitates via filtering, an obtained supernate is subjected to multi-stage ultrafiltration and microfiltration, is delivered through a nanofiltration multielement film integrated purification system so as to remove macromolecules, and is subjected separation purification and concentration so as to obtain a MT crude product; and (5) the MT crude product is subjected to dextrangel and ion-exchange column chromatography combined-purification separation, and drying so as to obtain a high-purity marine organism-sourced MT product. The induction and extraction separation method is capable of increasing metallothionein content in shellfish effectively, and obtaining marine organism-sourced high-efficiency heavy metal antidote products which possess high efficiency removing effects on heavy metal, and are safer.
Owner:THIRD INST OF OCEANOGRAPHY STATE OCEANIC ADMINISTATION

Method for enzymatic preparation of glutathione

The present invention discloses an enzymatic method for preparing glutathione (GSH), comprising the following steps: (1) producing glutathione in a reactor using GshF enzyme, ATP regeneration enzyme and AK enzyme; (2) separating immobilized GshF enzyme, ATP regeneration enzyme and AK enzyme in the reactor, or separating free GshF enzyme using a filtration device; (3) separating the filtrate obtained in step (2) to obtain a crude product GSH and a small amount of ATP, ADP and AMP; and (4) subjecting the GSH obtained in step (3) to concentration, crystallization, and drying to prepare a finished GSH. The disclosed method provides: greatly reduced industrial production costs; faster reaction rate; stable enzyme recovery system that is energy efficient and environmentally friendly; and capability of reusing the byproducts or collecting them for the production of ATP.
Owner:ANHUI GSH BIO TECH CO LTD

One-pot liquefaction process of biomass

The invention relates to the field of biological energy sources, in particular to a one-pot liquefaction process of biomass. The process comprises the following steps: firstly, preparing slurry containing a catalyst, a vulcanizing agent and biomass, and then introducing hydrogen into the slurry for carrying out a reaction. The slurry is prepared by the steps of sequentially carrying out drying, primary crushing, compressing and secondary crushing on plant oil residue, and then mixing the product with the catalyst and the vulcanizing agent to obtain a mixture; adding the obtained mixture into an oil product, and grinding to prepare slurry, wherein the prepared slurry is biomass slurry with a plant oil residue concentration of 50-65wt%. According to the one-pot liquefaction process of the biomass, a treatment process of first compressing and then secondary crushing is carried out on the plant oil residue for the first time, so that the volume of the plant oil residue is greatly reduced,the plant oil residue is more easily dispersed in the oil product, the content of the plant oil residue in the oil product is increased, and the concentration of a reaction material is increased; theone-pot liquefaction process increases the biomass conveying capacity of a pump within unit time, and guarantees the smooth operation and transportation of the pump.
Owner:BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD

Synthetic decapeptide and method for promoting generation of fish yolk

The invention discloses a synthetic decapeptide for promoting generation of fish yolk. The synthetic decapeptide is the decapeptide consisting of ten amino acids and is shown by a sequence identification number 2. The synthetic decapeptide refers to GnRH-II naturally secreted by a type of poultry. The invention discloses a preparation for promoting generation of fish yolk, wherein the preparation comprises the synthetic decapeptide. The invention discloses a method for promoting generation of fish yolk, wherein the method comprises the following steps of: implanting the preparation in a body wall or body cavity of teleostean; and promoting maturation of the teleostean yolk.
Owner:NAT PINGTUNG UNIV OF SCI & TECH

Energy-saving stirring device and energy-saving method

The invention provides an energy-saving stirring device of a concrete mixing carrier. The energy-saving stirring device comprises a pump, a three-position four-way reversing valve, a stirring motor, a stirring drum and an energy-saving subsystem, wherein the energy-saving subsystem comprises a first shuttle valve, a first two-position two-way pilot operated directional control valve, a second shuttle valve, a second two-position two-way pilot operated directional control valve, a power generation motor, a direct-current generator and a storage battery. By means of a logic loop formed by the two two-position two-way pilot operated directional control valves and the two shuttle valves, in the process that the stirring drum stops rotating, no matter whether the stirring drum rotates in the forward direction or the reverse direction, hydraulic oil used for power generation can only drive the power generation motor to rotate in the same direction, so that direct-current power generation is completed, energy recycling is achieved, the complexity of a regeneration loop is reduced, the operation cost is saved, and the integration level is high.
Owner:江西军喜建设有限公司

Ultrasonic cleaner for fruits and vegetables

The invention discloses an ultrasonic cleaner for fruits and vegetables. The ultrasonic cleaner comprises a rack, a working platform, ultrasonic water tanks and slings, wherein a water supplying system is arranged in the rack and is connected with each ultrasonic water tank; upright posts are arranged at two sides of the working platform through channel steel; a support is arranged between the upright posts; one sling is arranged at a position, corresponding to each ultrasonic water tank, of the support; each sling comprises a lifting box hanger, an eccentric wheel and a telescopic rod; each lifting box hanger is connected with a hanger support through one group of connecting rods which are symmetrically arranged; each eccentric wheel is arranged between each hanger support and the corresponding lifting box hanger; each hanger support is connected with a driving air cylinder through the corresponding telescopic rod. The ultrasonic cleaner disclosed by the invention is simple in structure; a plurality of ultrasonic water tanks are arranged; lifting boxes are clamped by the slings for cleaning the fruits and the vegetables in the lifting boxes, so that the cleaning flow is greatly simplified; the ultrasonic cleaner is simple in operation, high in working efficiency, good in generality and low in industrial product, and is suitable for larger-scale batch cleaning operation of the fruits and the vegetables; economic benefits of enterprises are favorably improved.
Owner:太仓宏璟瑞远物业管理有限公司

Metallothionein (MT) extraction and separation process for marine biological source efficient heavy metal removal agent

The invention provides a metallothionein (MT) extraction and separation process for a marine biological source efficient heavy metal removal agent. The process comprises the following steps: fish viscera subjected to homogenate are added into a buffer solution at the ratio, the pH of an extracting solution is adjusted to 7.0-9.0, the extraction temperature is controlled, and extraction is performed for 1-4 h while stirring; the extracting solution is heated for removing miscellaneous protein, the sediment is removed by centrifugation after cooling, the supernate is subjected to multi-stage ultrafiltration, microfiltration, treated by a nanofiltration multi-component membrane integrated purification system for removing macromolecules, and then subjected to separation and purification, and concentration, so that the MT crude product is obtained; the MT crude product is subjected to separation and purification through the combination of sephadex and ion-exchange column chromatography, and then drying is performed, so that high-purity marine biological source metallothionein product is obtained. The process provided by the invention has the advantages as follows: that the safety is influenced caused by reagent addition in the prior art is reduced, and the subsequent reagent removal process is eliminated; since cheap and rich fish viscera are used as resources for industrial production of MT, the extraction and separation steps are simplified, and a safer efficient marine biological source heavy metal removal agent product is obtained.
Owner:国家海洋局第三海洋研究院

Method for Modifying Properties of Graphene

A method for modifying properties of graphene includes a graphene film provision step and a modification step. In the graphene film provision step, a graphene film is provided, and the graphene is formed on a substrate. In the modification step, the graphene film is placed in a vacuum environment and radiated by an electron beam to obtain a graphene material.
Owner:METAL INDS RES & DEV CENT

Environment-friendly starch glue for packaging paper and preparation method thereof

The invention provides environment-friendly starch glue for packaging paper and a preparation method thereof. The environment-friendly starch glue for packaging paper is mainly prepared from, by weight, 10 parts of corn starch, 100 parts of water, 0.5-2.5 parts of oxidant and 3-5 parts of sodium hydroxide. The corn starch is adopted as the main raw material, which is environmentally friendly; heating is not needed in the production process which can be carried out at the room temperature, and the starch glue can be prepared whenever needed; modifiers such as preservatives and moisture-proof agents are not needed, overall properties such as adhesiveness and stability are excellent, the starch glue is economical, low in cost and high in practicality, process conditions are mild, and industrialization is easy to realize.
Owner:HEBEI UNIVERSITY

Method for fabricating ultra-fine nanowire

InactiveUS20130130503A1Limiting manufacturingLimiting applicationMaterial nanotechnologyNanoinformaticsTemperature controlNanowire
Disclosed herein is a method for fabricating an ultra-fine nanowire by combining a trimming process and a mask blocking oxidation process. The ultra-thin nanowire is fabricated by a combination of performing a trimming process on a mask to reduce a width of the mask and blocking an oxidation through the mask. A diameter of the floated ultra-thin nanowire fabricated by the method is controlled to 20 nm below by a thickness of a deposited silicon oxide film, a width of the silicon oxide nanowire after trimming, and a time and a temperature for performing a wet oxidation process. Also, since a speed of the wet oxidation process is faster, the width of the nanowire obtained by a conventional photolithography is reduced faster. Moreover, when fabricating an ultra-thin nanowire by using the method, the cost is reduced and it is more feasible to be implemented.
Owner:PEKING UNIV

Concrete taking waste glass as aggregate and preparation process thereof

The concrete taking the waste glass as the coarse aggregate obtained by the technical scheme can meet the index requirements on the concrete in the prior art, and by detecting the mechanical properties, chloride ion permeability resistance and scanning electron microscopes of the concrete according to different mixing amounts of glass, the test piece strength is 1.12 times of that of common concrete at most when the mixing amount is 63%; the chloride ion diffusion resistance is also enhanced, and the durability of the concrete is greatly improved. Besides, natural sand resources can be effectively saved through practical popularization of the technical scheme, the pressure of lacking of the natural sand can be greatly relieved by using the glass sand, construction waste is recycled, technical and economic policies related to resource saving and environment protection in China are implemented, and the glass sand is low-carbon and environment-friendly and has great significance and development prospects. In addition, the industrial cost can be further reduced, the cost of concrete per cubic meter is reduced, and huge economic benefits are brought to enterprises.
Owner:LANGFANG RONGSHENG CONCRETE

Backsheet for photovoltaic panels with double contacting face conductive elements of the non-through type and assembly method

Backsheet for photovoltaic panels with conductive interface elements intended to simplify the electrical connection of the terminal points of the circuit to the back junction box. The conductive elements are of the non-through type through the backsheet, with double contacting face, and are integrated on the front side towards the cells within recessed seats and in correspondence of through-holes in such a way as to enable an electrical connection by contact from the back side through the holes, in a guided way, by means of respective conductive elements protruding and fastened to the junction box. In particular, such a simplified contacting solution can be realized with extreme precision, without manual operations and at extremely low costs, with an automated assembly method.
Owner:VISMUNDA

Transverse diffusion metal oxide semiconductor (MOS) device with low on-resistance

The invention discloses a transverse diffusion metal oxide semiconductor (MOS) device with low on-resistance. The device comprises a P-type well layer and an N-type lightly doped layer which are positioned in a P-type substrate layer, wherein a gate oxide layer is arranged above the P-type well layer in an area between a source area and the N-type lightly doped layer; at least two grooves are formed on the upper part of the P-type well layer between the source area and the N-type lightly doped layer, and the etching depth of the grooves is between one fourth and one fifth of the junction depth of the source area; the N-type lightly doped layer consists of a first N-type lightly doped area, a second N-type lightly doped area and a P-type lightly doped area; the doping concentration of the first N-type lightly doped area is higher than that of the P-type lightly doped area, and the doping concentration of the P-type lightly doped area is higher than that of the second N-type lightly doped area; and the proportional range of the doping concentrations of the first N-type lightly doped area and the second N-type lightly doped area is 1.2:1-1.3:1. According to the power MOS device with the low on-resistance, the volume of the device is reduced, the response time of the device is shortened, the frequency characteristic of the device is improved, and the long-term stability of the performance parameter of the device is achieved.
Owner:SUZHOU VOCATIONAL UNIV

A printed circuit board processing method, system and copper foil for processing

The present invention provides a printed circuit board processing method, which includes the following steps: S1, laser cutting: using laser to cut out a circuit needed on the copper foil which is pasted on the carrier; S2, preferential viscosity processing: carrying out preferential viscosity processing to the copper foil and the carrier; S3, preferential adsorption: carrying out preferential adsorption to the cut copper foil corresponding to the non-circuit part; S4, peeling: peeling the non-circuit part of copper foil off the carrier to obtain the copper foil corresponding to the circuit part attached to the carrier; S5, preparation of the printed circuit board, transferring the copper foil of the circuit part on the carrier to the baseboard to obtain the printed circuit board. It is possible to use laser cutting to cut the printed circuit board, avoid chemical milling in the manufacture process, and directly recycle the waste copper, is of great value of environmental protection while reducing the cost, and a new thought for preparing printed circuit board with copper foil is provided.
Owner:曹昕
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