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Submarine repeater valve, 1950-1960

Submarine repeater valve, 1950-1960

1950-1960
Transistorized audio-frequency telephone line amplifier, 1954

Transistorized audio-frequency telephone line amplifier, 1954

1954
Transistorized audio-frequency telephone line amplifier, 1953

Transistorized audio-frequency telephone line amplifier, 1953

1953
Transistorized audio-frequency telephone amplifier, 1955

Transistorized audio-frequency telephone amplifier, 1955

1955
ROUTINER II circuit board from Empress Exchange, 1968

ROUTINER II circuit board from Empress Exchange, 1968

1968
Rack of equipment from Empress (West Kensington) PCM tandem exchange, 1968

Rack of equipment from Empress (West Kensington) PCM tandem exchange, 1968

1968
Circuit board, shelf 8, pos 3. from the Empress Exchange (West Kensington) PCM tandem exchange, made by the Post Office Research Centre, Dollis Hill, London, England, 1968

Circuit board from the Empress Exchange, 1968

1968
Circuit board ROUTINER I, shelf 5, pos 4, from the Empress Exchange (West Kensington) PCM tandem exchange, made by the Post Office Research Centre, Dollis Hill, London, England, 1968

ROUTINER I circuit board from Empress Exchange, 1968

1968
Circuit board S.BUF 035, shelf 9, pos 6., from the Empress Exchange (West Kensington) PCM tandem exchange, made by the Post Office Research Centre, Dollis Hill, London, England, 1968

S.BUF 035 circuit board from Empress Exchange, 1968

1968
Circuit Boards from Empress PCM Tandem Exchange, made by the Post Office Research Centre, Dollis Hill, London, England, 1968

Circuit boards from Empress Exchange, 1968

1968
Circuit boards, combined, REG B 003 and 3B, shelf 9, pos 4., from the Empress Exchange (West Kensington) PCM tandem exchange, made by the Post Office Research Centre, Dollis Hill, London, England, 1968

Circuit boards from Empress Exchange, 1968

1968
Rack from Empress PCM Tandem Exchange, made by the Post Office Research Centre, Dollis Hill, London, England, 1968

Rack from Empress telephone exchange, 1968

1968
Circuit board STORES 007, shelf 3, pos 6., from the Empress Exchange (West Kensington) PCM tandem exchange, made by the Post Office Research Centre, Dollis Hill, London, England, 1968

STORES 007 circuit board from Empress Exchange, 1968

1968
Black pipe and mounting bracket from Empress PCM Tandem Exchange, Post Office Research Centre, Dollis Hill, 1968

pipe and mounting bracket from Empress Exchange, 1968

1968
Miscellaneous parts from exchange and circuit boards, including detached labels, screws and knobs. From Empress PCM Tandem Exchange, Post Office Research Centre, Dollis Hill, 1968

Miscellaneous parts from Empress Exchange, 1968

1968