NC 07-27-1987 Machine Elements for 1ovement Transraission Industrial Belts Selection《移动传输的机械原理 工业皮带》.pdf

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ICONTEC 1716 1-1986 《机械产品 用于V字型工业皮带的波状滑轮，尺寸要求，英制系列》.pdf

ICONTEC 1716-1982 《机械产品 用于V字型工业皮带的滑轮》.pdf

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