| 单词 | rock drill |
| 释义 | > as lemmasrock drill rock drill n. a drill for boring into rock. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > boring tool > for boring in the ground auger1532 borer1572 boring-rod?1677 wimble1693 well borer1780 rock drill1836 miser1842 bore-rod1849 header1863 well drill1866 rig1875 well rig1875 trepan1877 broaching-bit1881 heading machine1897 1836 U.S. Patent 9,555X 1 (title) A. Turney, Expanding rock drill. 1877 R. W. Raymond Statistics Mines & Mining 37 Had it not been for the Burleigh rock-drill the work would have been abandoned long since. 1943 Triumphs of Engin. 202 (caption) In this ingenious development of the rock drill, compressed-air supplies the initial motive power. 1993 Professional Engin. Nov. 63/1 (caption) This rockdrill has been developed to be used in mining and runs on raw water. < as lemmas |
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