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Image
Has Image
5
Non-Commercial Use
5
Category
Telecommunications
4
Electronic Components
1
On Display
Science Museum
4
Information Age Gallery: Exchange
4
Object type
amplifier
3
telephone exchange
1
thermionic valve
1
Maker
Unknown maker; British Post Office
3
General Post Office Research Station, Dollis Hill
2
Place of origin
Post Office Research Station, Dollis Hill
5
Post Office Research Station, Dollis Hill, Dollis Hill, Brent, Greater London, England, United Kingdom
5
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Submarine repeater valve, 1950-1960
1950-1960
Transistorized audio-frequency telephone line amplifier, 1954
1954
Transistorized audio-frequency telephone line amplifier, 1953
1953
Transistorized audio-frequency telephone amplifier, 1955
1955
Rack of equipment from Empress (West Kensington) PCM tandem exchange, 1968
1968
