File:Semiconducter Devices Radioconducteur 07.jpg

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Semiconducter_Devices_Radioconducteur_07.jpg ‎(600 × 600 pixels, file size: 34 KB, MIME type: image/jpeg)

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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