ONORM M 9536 Teil 1-1985 Steel wire ropes ropes for oil-jield service round Strand ropes《钢丝绳 油田设备的绳索 圆多股绳》.pdf

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ONORM M 9541-1984 Steel wire ropes tension ropes round Strand ropes parallel construction《钢丝绳 张力绳索 圆多股绳，同时建造》.pdf

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