Telephone relay by S. G. Brown

Telephone relay by S. G. Brown, patent 27593 of 1911

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Telephone relay by S. G. Brown, patent 27593 of 1911
Science Museum Group
© The Board of Trustees of the Science Museum

Telephone relay by S. G. Brown, patent 27593 of 1911

Details

Category:
Telecommunications
Object Number:
1948-290
type:
relay
credit:
Prince, C.E.