File:Eugen Nesper — Radio-Schnell-Telegraphie 1922.jpg
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![File:Eugen Nesper — Radio-Schnell-Telegraphie 1922.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/30/Eugen_Nesper_%E2%80%94_Radio-Schnell-Telegraphie_1922.jpg/396px-Eugen_Nesper_%E2%80%94_Radio-Schnell-Telegraphie_1922.jpg?20230429210747)
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