| 单词 | percussion drill |
| 释义 | > as lemmaspercussion drill percussion drill n. a drill that works by delivering a rapid succession of heavy blows. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > drill > power drills > percussion drills pneumatic drill1861 percussion drill1871 road drill1907 hammer drill1908 piston drill1910 jackhammer1912 1871 W. P. Blake Notices Mining Machinery 49 The latter are all of the class of percussion drills, and cut by the force of the blow concentrated at the point of the drill. 1910 Times Engin. Suppl. 29 June 17/1 (heading) An electric percussion drill. 2002 Buffalo News (N.Y.) (Nexis) 14 Nov. b4 The officers seized 57 tool cases containing pneumatic drills, percussion drills and similar items. < as lemmas |
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