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File:Semiconducter Devices Radioconducteur 07.jpg

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[[Image:Semiconducter Devices Radioconducteur 07.jpg|thumb|right|An experimental radio wave detector invented in 1902 by Édouard Branly - it could produce a Direct Current signal without a battery - Image by BernieBLK]]

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current20:56, 1 March 2012Thumbnail for version as of 20:56, 1 March 2012600×600 (34 KB)Beichner (Talk | contribs)

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