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单词 diamond boring machine
释义

> as lemmas

diamond boring machine
diamond boring machine n. = diamond-borer n.
ΚΠ
1867 Jrnl. Soc. Arts 15 349 Diamond boring machine.
1875 R. Hunt & F. W. Rudler Ure's Dict. Arts (ed. 7) I. 442 The Diamond Boring Machine..The boring bit is a steel thimble, about 4 inches in length, having two rows of Brazilian black diamonds..in their natural rough state firmly imbedded therein.
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