William F. Friedman NSA Archive - History of the M-134-C, Three Volumes, 1944-1952 (2 Folders) - 4in1

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Files W.F.F. Archive Patent and Equipment Records History of the M-134-C, Three Volumes, 1944-1952 (2 Folders)

History of Converter M-134-C Volume 1

Document A522328

History of Converter M-134-C Volume 2

Document A523186

History of Converter M-134-C Volume 3

Document A523210