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单词 heart piece
释义

> as lemmas

heart piece
heart piece n. Mechanics a heart cam in a stopwatch or clock used for returning a hand to zero.
ΚΠ
1881 Horol. Jrnl. 23 94/1 To any convenient wheel in the ‘motion’ work, a heart-piece is fixed, in connexion with which is used a step-piece and levers.
1920 Jewelers' Circular 14 Jan. 145/2 Equipped with a heart piece for returning to zero.
2012 U.S. Patent 8,179,744 1 A switch mechanism that acts..by uncoupling the hand from the second heart-piece.
extracted from heartn.int.adv.
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