STAS 1740-1980 Cast iron and steel Ilanges GASKET FOR PACKING SURFACES WITH MALE AND FEMALE CONE JOINT NP 10..NP 100 Dimensions《铸铁和钢法兰 带有凸锥和凹锥的接头NP10的包装面用的垫圈NP 10…NP 100尺寸》.pdf

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