William F. Friedman NSA Archive - Reports, US/UK Communications Security (COMSEC) Equipment, 1953 - 4in1

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Files W.F.F. Archive Patent and Equipment Records Reports, US/UK Communications Security (COMSEC) Equipment, 1953

U.S. Communications Security Equipments and U.K. Cryptographic Equipments

Document A522530

UK/US COMSEC Conference

Document A522534