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Das Kryptophon, ein Mittel zur Geheimhaltung von Telephongesprächen

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L. Das Kryptophon, ein Mittel zur Geheimhaltung von Telephongesprächen. Naturwissenschaften 8, 38–39 (1920). https://doi.org/10.1007/BF02448676

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  • DOI: https://doi.org/10.1007/BF02448676

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