ONORM M 9533-1984 Steel wire ropes hauling ropes round Strand ropes normal construction《钢丝绳 拖绳 圆多股绳正常建造》.pdf

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ONORM M 9534-1986 Steel wire ropes hauling ropes round Strand ropes parallel construction《钢丝绳 拖绳 圆多股绳，同时建造》.pdf

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