William F. Friedman NSA Archive - Patent Data SISDE-12 & SISDE-13, Cryptanalytic Coincidence Counter Ideomorph and Isomorph Locator, 1937-1950 - 4in1

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Files W.F.F. Archive Patent and Equipment Records Patent Data SISDE-12 & SISDE-13, Cryptanalytic Coincidence Counter Ideomorph and Isomorph Locator, 1937-1950

Continuous Isomorphic Patternizer; Note from S. Kullback to William Friedman

Document A105025

Descriptions of Coincidence Machine and Machine for Locating Idiomorphs and Isomorphs; Cover Note and Enclosures from William F. Friedman to Dr. Kullback

Document A105026