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Catalogue description Security of messages sent by wireless in wartime
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| Reference: | MEPO 3/1917 |
|---|---|
| Description: |
Security of messages sent by wireless in wartime |
| Date: | 1940-1945 |
| Held by: | The National Archives, Kew |
| Former reference in its original department: | 30/40/432 |
| Legal status: | Public Record(s) |
| Closure status: | Open Document, Open Description |
| Access conditions: | Closed For 75 years |
| Record opening date: | 01 January 2021 |
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