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Files W.F.F. Archive Patent and Equipment Records Patent File, Navy Electric Ciphering Machines (ECM), 1924-1945
American Patents for "Enigma" Ciphering Machines
Document A60490
233.37 KiB
PDF
Application for Letters Patent on A Control Circuits for Electric Coding Machines
Document A60513
79.93 KiB
PDF
Contributions of the Signal Corps; Rowlett-Friedman Contributions to Hcm Cipher Machine
Document A60492
396.14 KiB
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Control Circuits for Electric Coding Machines; Patent Application Rejection
Document A60503
55.25 KiB
PDF
Control Circuits for Electric Coding Machines; Patent Rights Transfer
Document A60509
58.22 KiB
PDF
Distribution of Converter M-134 (SIGHIC) & M-134-A (SIGMYC)
Document A60500
96.66 KiB
PDF
Electric Ciphering Machines; Request for Opinion Concerning Patent Features
Document A60595
188.27 KiB
PDF
Friedman Research Into A Novel Mechanico-Electrical Cipher Machine
Document A60499
137.41 KiB
PDF
Invention Application-Control Circuits for Electric Coding Machines
Document A61601
108.06 KiB
PDF
Memorandum on Hebern Electric Code Machine
Document A60496
118.97 KiB
PDF
Patent Application for ECM Mark Ll
Document A61605
352.75 KiB
PDF
Patent Application Serial No. 568,368 for Control Circuits for Electric Coding Machines
Document A60507
56 KiB
PDF
Patent Situation with Regard Thereto Electric Ciphering Machines
Document A60531
168.47 KiB
PDF
Patent Situation with Regard to Electric Ciphering Machines
Document A60538
201.27 KiB
PDF
Patent Situation with Regard to Electric Ciphering Machines
Document A60566
283.52 KiB
PDF
Proposals for Modification of Hebern Electric Code Machine
Document A61596
139.77 KiB
PDF
Receipt of Classified Material
Document A60505
60.74 KiB
PDF
Request for Copy of Court Records on Patent Application No. 232,995
Document A60545
46.16 KiB
PDF
Secrecy Orders for Control Circuits for Electric Coding Machines
Document A60515
2.11 MiB
PDF
Summary of Opinion In Re: Electric Ciphering Machines-Patent Situation
Document A60555
63.31 KiB
PDF
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