Telephone exchange release alarm relay unit

Telephone exchange release ala Telephone exchange release alarm relay unit, c

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Telephone exchange release ala
Science Museum Group
© The Board of Trustees of the Science Musuem

Telephone exchange release alarm relay unit, c
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Telephone exchange release alarm relay unit, c.1950

Details

Category:
Telecommunications
Object Number:
Y2003.22.294.3
Measurements:
Overall: 210 mm x 150 mm x 65 mm,
type:
telephone relay
credit:
Gift of British Telecommunications plc