| 单词 | broaching-bit |
| 释义 | > as lemmasbroaching-bit broaching-bit n. (see quot.). 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 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 112 Broaching-bit, a tool used to restore the dimensions of a bore-hole which has been contracted by the swelling of the marl or clay walls. < as lemmas |
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