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19. Jh.

Walzen-Phonograph Edison Standard Walzen-Phonograph Edison Standard Phonograph Walzen-Phonograph Edison Standard

20. Jh.

Datenmodem Telefunken DM 2405S Mobiles Datenübertragungs- und -verschlüsselungsgerät Telekrypt Mini mit Akustikkoppler Telefonzelle und Briefkasten aus dem Britannia Center in Spandau Sprechanlage Telefunken Bedienpult Personenrufanlage Telefunken Bedienpult Personenrufanlage Telefunken ELA D 513 Bedienpult Personenrufanlage Telefunken System 3003 Bedienpult Personenrufanlage Telefunken System 3003 Sprechanlage HV 05/50 Bedienpult Personenrufanlage Telefunken ELA D 510 Fernschreiber - Blattschreiber, Bild 1, Foto 1956 Fernschreiber - Blattschreiber, Bild 2, Foto 1956