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Dongying Zhengda Metal Product Co., Ltd is a co***ny including an investment casting foundry , a machining factory and a polishing factory that specializes in production of stainless steel, carbon steel , alloy steel ,etc.The products mainly include pipe fittings, construction hardwares, marine hardwares ,the machine parts and so on, which is four big series.The co***ny has advanced technology and an experienced working team.We can provide process sevice from tool development to surface treatment accordin...
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