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MULLARD ORA VALVE, 1923

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MULLARD ORA VALVE, 1923

The Mullard ORA Valve of 1923.
The title means Oscillates Rectifies Amplifies.
The three possible main functions of the valve.

Maker known then as the Mullard Wireless Service Company Ltd

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A0603



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