Polarised relay 3000 type for exchange ringing on two button D.C. omnibus circuits

SMG00305582
Science Museum Group
© The Board of Trustees of the Science Museum

Polarised relay 3000 type for exchange ringing on two button D.C. omnibus circuits, Newports station exchange

Details

Category:: Telecommunications

Object Number:: 1971-331

type:: polarised relay

credit:: British Railways, Western

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Polarised relay 3000 type for exchange ringing on two button D.C. omnibus circuits

Details

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