HB 3491-1985 不通孔用二齿平刃直柄扩孔钻d=5~10mm.pdf

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HB 3491-1985 不通孔用二齿平刃直柄扩孔钻.pdf

HB 3491-1985 不通孔用二齿平刃直柄扩孔钻 d＝5~10mm.pdf

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