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five-line single cord switchboard, 1900-1909

Telecommunications

1900-1909

Switchboard for German military portable X-ray apparatus

Radiomedicine

1914-1918
Lighting switchboard installed in a church in Gloucester in 1899, and used for forty years

Electric Lighting Switchboard, Gloucester, 1899

Electricity Supply

1899
Electrical switchboard, for use in dental surgeries, by the Dental Manufacturing Co., London, 1910-1925

Electrical switchboard, for use in dental surgerie

Dentistry

1910-1925
Switchboard for X-ray machine. English, 1906-1920

Switchboard for X-ray machine. English, 1906-1920

Radiomedicine

1906-1920