| 单词 | hopper spring |
| 释义 | > as lemmashopper spring hopper spring n. ΚΠ 1840Hopper spring [see hopper button n.]. 1896 A. J. Hipkins Descr. & Hist. Pianoforte Gloss. Hopper Spring, the wire spring that regulates the angle of the sticker or hopper, and accelerates its return under the notch or roller. < as lemmas |
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