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D bit cutter : ウィキペディア英語版 | D bit cutter A D bit cutter is a specialty bit in the shape of a "D" when looking from above. Often used to make precision holes using a lathe. "This type of drill was first used in the early manufacture of muskets and other artifacts requiring a long straight holes in the days before modern accurate machines were available." 〔(WebCite query result )〕 〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「D bit cutter」の詳細全文を読む
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