| 单词 | punch-prop |
| 释义 | > as lemmaspunch-prop punch-prop n. Mining a short pit prop. ΚΠ 1849 G. C. Greenwell Gloss. Terms Coal Trade Northumberland & Durham 40 Punch-prop, a short prop, set upon a crowntree or balk, where it does not support the middle of the roof... Also, a short prop, about 14 or 15 inches long, placed by a hewer under his sump or back-end. 1980 M. Brown et al. Gloss. Mining Terms Fife 61 Punch prop, a wooden prop placed at the foot of a girder to give support. < as lemmas |
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