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补充和扩展了原Ｃ６２０—１车床铭牌螺距调配表，可解决许多进口设备非米制螺纹和非标准螺纹的 加工问题。
Supplement and expansion of the original C620-1 lathe nameplate pitch allocation table to solve many imported equipment non-metric thread and non-standard thread processing problems.