... harmonic synthesizer 调和推算机 harmonic telegraph 谐波电报 harmonic telephone ringer 谐波电话振铃器 ...
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harmonic source telegraph 谐波电报
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At that time he invented what he called his "harmonic telegraph."
VOA: special.2010.05.14
In that moment, Bell knew the answer to the puzzle of the harmonic telegraph.
NEWYORKER: In the Air
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