STAS 1742-1980 Cast iron and steel flanges GASKET FOR PACKING SURFACES WITH FEMALE AND MALE GRO- OVED JOINT NP 10...NP 40 Dimensions《铸铁和钢法兰 带有凹槽和凸槽接缝封装面用的垫圈NP10 NP 40 尺寸》.pdf

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