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小型コヒーラ検波器。2008年11月18日 合資会社平川研究所よりHP写真の転載許可。(This is a photograph of a small coherer wave detector of the practical use. I reprinted this photograph in wikipedia from the homepage of Hirakawa Institute on November 18, 2008 and got permission to show.)
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({{PD-author|平川研究所}} 2008年11月18日 合資会社平川研究所より提供。小型コヒーラ検波器。It was allowed to print this photograph in wikipedia from Hirakawa Institute on November 18, 2008 me. A small coherer wave detector.
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