William F. Friedman NSA Archive - Correspondence, Description and Diagram, SISDE-30 Authentication Device, Rosen and Friedman, 1941 - 4in1

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Files W.F.F. Archive Patent and Equipment Records Correspondence, Description and Diagram, SISDE-30 Authentication Device, Rosen and Friedman, 1941

SISDE-30 Authentication Device, 6 November 1941

Document A67602