Telephone exchange release alarm relay unit

Telephone exchange release alarm relay unit

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Telephone exchange release alarm relay unit
Science Museum Group
© The Board of Trustees of the Science Musuem

Telephone exchange release alarm relay unit, c.1950

Details

Category:
Telecommunications
Object Number:
Y2003.22.294.1
Measurements:
Overall: 210 mm x 150 mm x 65 mm,
type:
telephone relay
credit:
Gift of British Telecommunications plc