File:Kristall-Detektorempfänger 1925 - Bananenstecker.jpg
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![File:Kristall-Detektorempfänger 1925 - Bananenstecker.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/Kristall-Detektorempf%C3%A4nger_1925_-_Bananenstecker.jpg/800px-Kristall-Detektorempf%C3%A4nger_1925_-_Bananenstecker.jpg?20150108234701)
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