MSZ 9851 2-1981 《绝缘电线的金属保护管和配件 配件的技术要求和检测方法》.pdf

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SAE J 513-1999 Refrigeration Tube Fittings - General Specifications《制冷管配件 一般规范》.pdf

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STAS 6938-1964 《制冷设备 黄铜弯管大小》.pdf

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