William F. Friedman NSA Archive - Diagram, Means and Methods of Controlling Intermittent Action of the Second of Two Key-Tape Transmitters, At&t System, SISDE-19, 26 March 1935 - 4in1

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Files W.F.F. Archive Patent and Equipment Records Diagram, Means and Methods of Controlling Intermittent Action of the Second of Two Key-Tape Transmitters, At&t System, SISDE-19, 26 March 1935

Invention: Means and Method of Controlling Intermittent Action of 2d of Two Keytape Transmitters, at & T System (SISDE-19)

Document A67333