REGINALD FESSENDEN radio americana pionero que trabajó con Thomas Edison - véase la descripción a continuación para más detalles Fotografía de stock - Alamy
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29 dicembre 1891, Thomas Edison brevetta la radio aggiudicandosi un rivoluzionario primato destinato a cambiare indelebilmente
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R-4 Ch= 7R + 8P Radio Edison, Thomas A., North American Phonograph | Radiomuseum
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R-5 Ch= 7R + 8P Radio Edison, Thomas A., North American Phonograph | Radiomuseum