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美国卫生研究院文献>Journal of the Royal Society of Medicine
>The Thermionic Valve of Professor J. H. Fleming—a Piece of Apparatus capable of amplifying Sound with a Demonstration to show the Possibilities of applying the Thermionic Valve to aid the Deaf
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The Thermionic Valve of Professor J. H. Fleming—a Piece of Apparatus capable of amplifying Sound with a Demonstration to show the Possibilities of applying the Thermionic Valve to aid the Deaf
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机译:弗莱明教授(J. H. Fleming)的热电子瓣膜-一种能够放大声音的装置并演示了使用热电子瓣膜帮助聋人的可能性