Photographophone
A photographophone is a device, first developed by Ernst Ruhmer of Berlin, Germany in 1900, used to produce and play back audio recordings. Photographophone recording uses celluloid film.
A photographophone is a device, first developed by Ernst Ruhmer of Berlin, Germany in 1900, used to produce and play back audio recordings. Photographophone recording uses celluloid film.
A photographophone is a device, first developed by Ernst Ruhmer of Berlin, Germany in 1900, used to produce and play back audio recordings. Photographophone recording uses celluloid film.
Source: Wikipedia "Photographophone" · CC BY-SA 4.0
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