William F. Friedman NSA Archive - Memoranda and Reports Related to Policies on the Use of SIGABA/ECM (Electric Ciphering Machines), Includes Photographs and Diagrams, 1948-1952 - 4in1

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Files W.F.F. Archive Patent and Equipment Records Memoranda and Reports Related to Policies on the Use of SIGABA/ECM (Electric Ciphering Machines), Includes Photographs and Diagrams, 1948-1952

Alteration of Secret Status of Patent Application Serial No.-Armed Services Patent Advisory Board (Blank Form)

Document A272521

Combined Cipher System for SSOS

Document A2436228

Discussion with Lt. Col. Henn-Collins, Royal Signals, Concerning ECM/Sigba Principles

Document A2436194

Release of Crypto-Equipments to Great Britain and NATO

Document A2436227

Release of the Principles of the CSP 2900 to the U.K., Canada, Australia, and New Zealand

Document A2436206

Release of the Principles of the ECM to the U.K., Canada, Australia, and New Zealand

Document A2436229

Replacement of the CCM

Document A2436230

U.S. and British Use of Ecms

Document A2436186

UK Familiarity with the ECM Principle

Document A2436197

United States-United Kingdom Security Agreement

Document A2436239