Dictograph loudspeaking 'master' house-telephone unit, c 1940.
4 0 c m
 
29cm
actual image size: 21cm x 32cm

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

Exton, David

© Science Museum / Science & Society Picture Library

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.
 

Artist

 

Image Ref.

10433079
 

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