| 单词 | rock bit |
| 释义 | > as lemmasrock bit rock bit n. Oil Industry a bit (bit n.1 6) used for drilling hard formations. ΘΚΠ society > occupation and work > equipment > oil and natural gas recovery equipment > [noun] > drilling equipment > drilling bits roller bit1858 rock bit1875 spudding bit1907 underreamer1912 oil string1921 spudder1922 1875 U.S. Patent 165,787 1/1 The invention relates more particularly to rock bits or drills, the cutting-surfaces of which are composed of diamonds. 1920 Engin. & Mining Jrnl. 7 Feb. 404/1 The invention and development of rotary rock bits lagged behind the introduction and successful application of the rotary method of drilling. 1993 Roustabout Aug. 15/2 (advt.) Hughes Christensen, the world leader in drill bit technology, provides a full line of both rock bits and diamond bits. < as lemmas |
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