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Desk Telephone Apparatus

Desk Telephone Apparatus
Berthon-Ader France, 1878 y.

Desk Telephone Apparatus. «Berthon- Ader». France. 1878 Made of Perspex, which replaced the vibrating board and was created by Monsieur Korbant in order to demonstrate the device’s internal operation. The button was located on the device’s wooden base. Comprised of external local batteries of glass and liquid.