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Catalogue description Account of the methods used for breaking German teleprinter cypher messages
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| Reference: | HW 25/4 |
|---|---|
| Description: |
Account of the methods used for breaking German teleprinter cypher messages |
| Date: | 1941 June 01-1945 June 30 |
| Held by: | The National Archives, Kew |
| Former reference in its original department: | GENERAL REPORT ON TUNNY VOLUME I |
| Legal status: | Public Record(s) |
| Closure status: | Open Document, Open Description |
| Access conditions: | Closed Until 2000 |
| Record opening date: | 28 September 2000 |
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