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Wall Mounted Telephone Apparatus

Wall Mounted Telephone Apparatus
Manufacturer unknown Switzerland, 1920 y.

Wall Mounted Telephone Switzerland. 1920. Terminals were used only to make line connection. This model had a peculiar addition: i.e. the existence of an ‘excess-voltage’ suppressor on top of the device (two terminals with several serrations inside). Signals would be lost during storms, for example, so users were given special fuses.