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Patent：2023 Corrosion-resistant composite pipePatent：2022 Welding protective atmosphere deviceCertification：ISO 45001（Li'enwei International Certification Co., Ltd.）Certification：ISO 50001（Li'enwei International Certification Co., Ltd.）Certification：ISO 9001（Metal Industries Research & Development Centre (MIRDC)）Certification：TOSHMS（Li'enwei International Certification Co., Ltd.）Company website：https://www.chsteel.com.tw/Phone：07-6117171Main product：Iron & steel

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