A method of connecting the bit and the rods or cable in an apparatus for drilling rocks by impact, by means of which at each up-stroke a jar of…
单词 | θ212284 |
释义 | society > occupation and work > equipment > piercing or boring tools > [noun] > boring tool > for boring in the ground > method of connecting boring rods and bit (1) jar1865 A method of connecting the bit and the rods or cable in an apparatus for drilling rocks by impact, by means of which at each up-stroke a jar of… |
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