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15,571 Results

  • LETTER TO GENERAL CHURCHILL https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781339082039.pdf Date: March 28, 2018
  • LETTER ON PROPOSED MODIFICATIONS OF THE METHOD USED BY THE AT & T CIPHER PRINTING MACHINE https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781349082040.pdf Date: March 28, 2018
  • LETTER ADDRESSED TO COLONEL FABYAN https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781379082043.pdf Date: March 28, 2018
  • LETTER TO COLONEL FABYAN https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781409082047.pdf Date: March 28, 2018
  • LETTER TO COLONEL MAUBORGNE https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781439082049.pdf Date: March 28, 2018
  • LETTER TO COLONEL FABYAN ON 150 CIPHER TAPES https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781459082051.pdf Date: March 28, 2018
  • LETTER TO COLONEL FABYAN https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781479082053.pdf Date: March 28, 2018
  • LETTER TO COLONEL FABYAN https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781499082055.pdf Date: March 28, 2018
  • LETTER TO GENERAL CHURCHILL ON RIVERBANK CONFERENCE https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781519082057.pdf Date: March 28, 2018
  • LETTER TO MAJOR CROCKETT https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/patent-equipment/FOLDER_545/41781529082058.pdf Date: March 28, 2018