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GPO REVERSING RELAY, 1950's

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GPO REVERSING RELAY, 1950's

Relay used for reversing polarity of lines, made from an old Morse sounder.
Originally sold at the BT Museum Auction

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A0081



2007 The Museum of Technology, The Great War and WWII
Company registered in England No. 7452160, Registered Charity No. 1140352, Accredited Museum No. 2221