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Olga Gray and the Woolwich Arsenal Spy Ring
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Catalogue reference: ADM 220/1358
This record is about the New audio-frequency discriminator for use in carrier shift receivers dating from 1948 in the series Admiralty: Admiralty Surface Weapons Establishment and predecessors: Records. It is held at The National Archives, Kew.
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New audio-frequency discriminator for use in carrier shift receivers
ADM 220
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New audio-frequency discriminator for use in carrier shift receivers
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