单词 | post drill |
释义 | > as lemmaspost drill post drill n. ΚΠ 1888 Science 13 Apr. 172/1 1 post-drill 15 inches. 1975 Publ. Amer. Dial. Soc. 1973 lix. 46 Post drill.., a drill supported by a post running from top to bottom immediately in front of the face which is turned and driven into the coal by rotating a handle that fits into a gear box mounted on the post. 2001 C. H. Wendel Encycl. Antique Tools & Machinery 60/2 Very early post drills in good condition will often bring over $200, with even the more common ones of the twentieth century bringing $100 or more at times. < as lemmas |
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