Application for Patent on Authenticating Device and Related Correspondence, 1944-1950
Application for Patent on Electrical Cryptograph and Related Correspondence, 1944-1959
Application for Patent on Facsimile Enciphering System and Related Correspondence, 1943-1951
Application for Patent on System for Enciphering Facsimiles and Related Correspondence, 1937-1959
Communication and Cryptographic Equipment Research, Etx Telewriter, 1949-1951
Communications and Cryptographic Equipment Research, 1934-1951
Communications Security and the Purchase of Hagelin Machines, 1952
Correspondence on Inventions, Patents, and Unsolicited Suggestions, 1932-1953
Correspondence on Printer Telegraph Cipher Machines, 1919-1935
Correspondence on Printer Telegraph Cipher Machines, 1921
Correspondence, Contract, Contract Bids, Photographs, and Diagrams, Supply and Installation of A Complete Electric Burglar Alarm System In Army Munitions Building, Washington, D.C., 1940
Correspondence, Description and Diagram, SISDE-30 Authentication Device, Rosen and Friedman, 1941
Correspondence, Description, Diagrams, SIS Systems SISDE-11-Cipher Wheel Commuters, Internally Controlled, Serial No. 70,412, Formerly Known AS M-161, 1935-1947
Correspondence, Description, Diagrams, SISDE-20, Cipher System and Apparatus for Plural-Unit-Code Telegraph Printer, 1936-1939
Correspondence, Historical Reports, Related to Patent Application 443,320, 1949-1951
Correspondence, License, Patent Records, Notes, Diagrams, SISDE-25 Authentication System for Banks, 1944-1950
Description of the General Principles of an Invention of A Machine for Locating Idiomorphs and Isomorphs In Cryptanalysis, 1937-1938
Description, Notes, and Diagram for Invention of Simple Printing Mechanism for Baudot Code System, SISDE-22, 1935
Diagram, Means and Methods of Controlling Intermittent Action of the Second of Two Key-Tape Transmitters, At&t System, SISDE-19, 26 March 1935
Diagram, SISDE-26, Cryptographic Machine, 1927
Diagrams, Descriptions, Patent Application Files, SISDE-24 Stylus Operated Keyboard for A Small Portable Cryptograph (Converter M-325), 1944-1953
Diagrams, Descriptions, Patent Application Files, SISDE-29, Converter M228, Serial No. 443,320, Crypt System and Apparatus for Electrical Printing Telegraphy (16 May 1942), 1941-1953
Enigma Materials for Hand Method Attack with Paper Cipher Strips by Colonel Friedman, Arlington School, 1943-1945
Extracted Correspondence Related to Patent Information Related to Theodore I. Przysiecki and Dehn (US Patent Nos. 2,405,570 and 2,401,507), 1947-1948
Extracted Minutes of Signal Corps Patent Board, Meetings No. 1-39 Regarding Crypto-Systems Discussions, 1936-1941
Friedman's Patent File (Including Photographs and Diagrams) on Converter M-134-T2, US Patent Serial No. 682,096, SISDE-7, 1933-1952
Guidelines for Security Classification, 1955; Open Source Mention of Use of Electronic Computers In Cryptography, 1957; Crypto-Mathematics Institute Bulletin, September 1958
Hagelin Patents, 1942-1954
Hagelin Telecrypto System, 1950-1952
History of the M-134-C, Three Volumes, 1944-1952 (2 Folders)
Instruction Book for Converter M-134-T2 and Associated Electrical Typewriter (Including Photographs and Diagrams), 1936
List of Pending Patent Applications AS of 1936 and Issued Patents 1926-1946 Showing Patent Number, Date Issued, Inventor(s), Title, and Description, 1946
List of SISDE Numbers for Cipher Devices, Machines, Etc. Including Type Number, Description, Inventor, US Patent Application Serial No., Date, US Patent No., and Date of Issue, 1942
Memoranda and Correspondence, Surplus Disposal and Exchange of Cryptographic Equipment (M-209), 1936-1954
Memoranda and Reports on Legislation and Patents Compiled by Friedman, 1937-1948
Memoranda and Reports on the Wadsworth, Decius, Cipher Device, 1943-1949
Memoranda and Reports Regarding A Cipher Teleprinter, 1947-1950
Memoranda and Reports Related to Policies on the Use of SIGABA/ECM (Electric Ciphering Machines), 1940-1952
Memoranda and Reports Related to Policies on the Use of SIGABA/ECM (Electric Ciphering Machines), 1943-1950
Memoranda and Reports Related to Policies on the Use of SIGABA/ECM (Electric Ciphering Machines), Includes Photographs and Diagrams, 1948-1952
Memoranda and Reports Related to the Development, Maintenance, and Service Tests of Cryptographic Equipment, 1946-1949
Memoranda and Reports, Use of SIGABA In Conjunction with Standard IBM Codatype Units, 1943
Memoranda and Working Notes, List of Patents on Electro-Mechanical Cipher Machines Pertinent to the Hebern Case, 1949
Memoranda on Cryptographic Patents and Friedman's Original Worksheets of the Hebern Solution, 1935-1948
Memoranda Regarding Authenticating Device, 1935-1944
Memoranda Regarding Modification and Instruction Manual of the M-209, 1947-1949
Memoranda Regarding Suggested Solution of Commercial Enigma, 1943
Memoranda, Drawings, and Cryptograph Specifications Description, SISDE-6 SIS (Signal Intelligence Service) System-Message Authentication, 1933-1935
Memoranda, Electronic Code Machine (ECM) Hebern (Including Negative Images of the Machine), 1924
Memoranda, License, Descriptions, Diagrams, M-138 Patent Application, SISDE 15 & 16, Application No. 300,212, US Patent No. 2,395,863, Issued 5 March 1946, 1929-1946
Memoranda, Litigation Files, Patent Files, Diagrams, Newspaper Clippings, Relating to the Hebern Patent Infringement Claim, 1922-1949
Memoranda, Patent Applications Nos. 107,244 and 682,096 of William F. Friedman Re: Proposed Motion Control Means, 19 September 1949
Memoranda, Patent Publications, Issued Patents by Friedman, 1938-1955
Memoranda, Policies, Patent Publications, Related to US Government Policy on Patents and Release of Technical Information by Government Employees, 1936-1951 (2 Folders)
Memoranda, Procedures, Policies, and Requirements Related to Packaging and Long-Term Storage of Various Cryptographic Devices, 1944-1949
Memoranda, Release of Crypto Equipment to Foreign Governments (M-209), 1953-1954
Notes and Diagrams, Subjects Include Printing Telegraphy, Protecting Crytpoteleprinter Transmissions, Electric Cryptograph, Special Modifications In M-161 for A Smaller Cryptograph, 1935-1943
NSA Field Commanders Conference Book, March 1955; Official Report of the NSA Field Commanders Conference, April 1955
Papers on the Security of AFSAM 4a Machine (1955), Plain Text Radiation Study of Tsec/Kl-7, Comments on Afsay D802 (1955 "Enciphered Motion" Branching Structure, 1955
Patent Data SISDE-12 & SISDE-13, Cryptanalytic Coincidence Counter Ideomorph and Isomorph Locator, 1937-1950
Patent Data SISDE-14, Systems and Means for Enciphering and Deciphering Magnetically Recorded Signals, 1932-1937
Patent Data SISDE-17, Application No. 478,193, 1936-1951
Patent Data SISDE-18, Application No. 478,868, System for Enciphering and Deciphering Telephotograms, Friedman and Mauborgne (1943), 1924-1947
Patent Data SISDE-4, Serial No. 350,713, Patent No. 1,857,374, Cryptograph, Evans, Friedman, and Graham (1924), 1923-1924
Patent File, Navy Electric Ciphering Machines (ECM), 1924-1945
Patent File, SIGABA Signals Intelligence Service (SIS) Systems, M-134-T2 (SISDE-7), Serial No. 682,096, 1933-1941
Patent File, SIGABA SISDE-8, Modified M-134-T2, Serial No. 107,244, Means for Controlling Displacement of Cipher Wheels on Hebern Type Cryptograph, 1935-1955
Patent File, SISDE-10, File on Patent Application for Cipher Machine, Constantly Rotating Commutator Machine, Serial No. 157,383, 1936-1938
Patent File, SISDE-11 Friedman and Rowlett Self-Controlled Cryptographs, Serial No. 70,412, 1935-1953
Patent File, SISDE-31 Indicating Device, 1936
Patent File, SISDE-5, Single Commutator Cryptograph, Serial No. 588,344, Patent No. 2,028,772, Friedman and Graham, 1930-1936
Patent File, SISDE-6 Authentograph System, 1935-1937
Photographs and Negatives, Enigma Printing Model and Non-Printing Model (R-27), 1954
Photographs, Drawings, and Photostated Pictures of the M-325, 1935
Randomizer Patent Papers SISDE-23, Serial No. 36,868, US Patent No. 2,166,137, Electric Switching Mechanism, Friedman and Rowlett (18 July 1939), 1926-1939
Report, Pneumatic Authenticator or DEM 498, 1954
Reports, US/UK Communications Security (COMSEC) Equipment, 1953
SIGABA SISDE-28, Method of Commutator Control for M-134-T2, Friedman and Graham, 1933-1941
Signal Corps Laboratories, Description and Operating Instructions for Converter M-134 (Including Photographs and Diagram), 1932
Signal Intelligence Service (SIS) Systems, Randomizing Device for Electric Card Sorter, SISDE-23, Serial No. 36,868, US Patent No. 2,166,137, Friedman and Rowlett (18 July 1939), 1935-1939
SISDE-11 Drawings, 1931-1935
Status Reports of Research and Development Phases of Cryptographic Equipment, Extract from the Final Report of G-2-D, General Headquarters (Ghq) American Expeditionary Forces (Aef (1 May 1919) Regarding Censorship and Use of Invisible Ink, 1944-1946
Storage and Destruction of SIGSALY and Associated Equipments, 1947-1948
US and UK Patent Publications, 1912-1936
Volume I General Description Report (Including Photographs and Diagrams) on "DERVISH (Building Block Philosophy of Analytic Machine Assembly with Rotor Solution Devices) Given to Friedman, Memo on Friedman's Analysis of DERVISH, 1954
War Department Publication, Technical Paper of the Signal Intelligence Section War Plans and Training Division (Register No. 11), Analysis of A Mechanico-Electrical Cryptograph Part 11, 1935
Working Notes and Diagrams for Invention of Means for Controlling Displacements of Cipher Wheels, Hebern Type of Cryptograph, SISDE-21, 27 March 1935