Catalogue description German Naval Intelligence successes against Allied cyphers, prefixed by a general survey...

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Details of HW 40/7
Reference: HW 40/7
Description:

German Naval Intelligence successes against Allied cyphers, prefixed by a general survey of German Sigint
Date: 1939 Jan 01 - 1945 Dec 31
Held by: The National Archives, Kew
Legal status: Public Record(s)
Closure status: Open Document, Open Description
Access conditions: Retained Until 2003
Record opening date: 21 August 2003

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