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单词 phonodynamograph
释义

> as lemmas

phonodynamograph
phonodynamograph n. Obsolete rare an instrument for amplifying the vibrations of a diaphragm, esp. in an acoustic device.
ΚΠ
1882 Nature 3 Aug. 331/1 Mr. W. B. Cooper has lately brought before the Franklin Institute a device for increasing the dynamic effect of the vibrations of diaphragms..called a ‘phonodynamograph’.
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as lemmas
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