Dictograph loudspeaking 'master' house-telephone unit, c 1940.

Exton, David

Dictograph loudspeaking 'master' house-telephone unit, c 1940.
3 3 c m
40cm
actual image size: 32cm x 25cm

Description

The office intercom consisted of this 'master station' and several substations. It enabled a supervisor to speak to any assistant or set up a conference call.

© Science Museum / Science & Society Picture Library

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