William F. Friedman NSA Archive - Working Notes and Diagrams for Invention of Means for Controlling Displacements of Cipher Wheels, Hebern Type of Cryptograph, SISDE-21, 27 March 1935 - 4in1

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Files W.F.F. Archive Patent and Equipment Records Working Notes and Diagrams for Invention of Means for Controlling Displacements of Cipher Wheels, Hebern Type of Cryptograph, SISDE-21, 27 March 1935

Friedman Sketches-Invention: Means for Controlling Displacement of Cipher Wheels, Hebern Type of Cryptograph, SISDE-21

Document A67515