| 单词 | punching bear |
| 释义 | > as lemmaspunching bear punching bear n. a machine for punching holes in sheet metal; = bear n.1 7. ΚΠ 1873 C. P. B. Shelley Workshop Appliances ix. 265 One or two instruments were mentioned which, although worked by hand, were capable of perforating plates of considerable thickness. Such are the ‘punching bear’ and other portable forms of apparatus. 1875 E. H. Knight Pract. Dict. Mech. Punching-bear, a machine for making holes in sheet-metal, operated by simple lever power or by hydraulic pressure. 1935 Times 19 Feb. 28/5 (advt.) Pneumatic Hammers, Drills, Hydraulic Riveters and Punching Bears. < as lemmas |
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