William F. Friedman NSA Archive - 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

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Files W.F.F. Archive Patent and Equipment Records 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

Index of Various Patents Submitted by Mr Friedman, January 1942; SISDE Number Index for Cipher Devices, and Machines

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