William F. Friedman NSA Archive - Diagrams, Descriptions, Patent Application Files, SISDE-24 Stylus Operated Keyboard for A Small Portable Cryptograph (Converter M-325), 1944-1953 - 4in1

4in1 by idb & friends

articles files wiki about invisible college

Files W.F.F. Archive Patent and Equipment Records Diagrams, Descriptions, Patent Application Files, SISDE-24 Stylus Operated Keyboard for A Small Portable Cryptograph (Converter M-325), 1944-1953

Friedman Correspondence to the Department of Commerce Regarding His Patent Application for the M-325

Document A70340