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单词 kelly board
释义

> as lemmas

kelly board
kelly board n.
ΚΠ
1925 H. C. George in Bull. U.S. Bureau of Mines No. 224. 115 Means of escape from..the kelly board on every drilling and redrilling derrick shall be provided.
1942 L. V. Berrey & M. Van den Bark Amer. Thes. Slang §516/2 Kelly-board, a platform at the height of the ‘kelly’.
extracted from kellyn.2
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