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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Watts Brothers Tool Works ： ウィキペディア英語版 Watts Brothers Tool Works Watts Brothers Tool Works is a tool manufacturer located in Wilmerding, Pennsylvania. They are known for manufacturing drill bits that can drill square holes,〔(Drilling Square Holes )〕 including blind holes which cannot be made with other methods such as broaching. The Harry Watts square drill bit is based on a Reuleaux triangle shape, and is used together with a guide and a special chuck to make a square hole.〔Watts, Harry J., "Drill or Boring Member", U.S. patent #1,241,176, applied for November 1, 1916, granted September 25, 1917.〕 Similarly, the company also manufactures drill bits for other angular holes such as pentagons and hexagons. ==References== 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「Watts Brothers Tool Works」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.