An attachment at the top of a boring rod by means of which it is withdrawn.
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| 单词 | θ212282 |
| 释义 | society > occupation and work > equipment > piercing or boring tools > [noun] > boring tool > for boring in the ground > parts or attachments (7) topit1839 An attachment at the top of a boring rod by means of which it is withdrawn. brake1849 A lever or handle for working a machine. A lever forming part of the apparatus for boring coal. tiger1864 As a name for various implements: see quots. bore-log1870 a perforated block of wood through which the bore-rod passes. brace-head1875 stretcher-bar1883 (a) the bar which is set across a level as a support for a rock-drill; (b) Leather Manufacturing an appliance for stretching hides transversely; (c)… sabot1884 Mechanics. The iron shoe or point of a pile (E. H. Knight Pract. Dict. Mech. Suppl., 1884); an iron shoe used to protect the end of a file for… |
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