Carbon pellet transmitter with switch hook

Carbon pellet transmitter with switch hook (wall instrument)

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Carbon pellet transmitter with switch hook (wall instrument)
Science Museum Group
The Board of Trustees of the Science Museum

Carbon pellet transmitter with switch hook (wall instrument) made by the Societe General de Telephones

Details

Category:
Telecommunications
Object Number:
1915-239
type:
transmitter
credit:
General Post Office