Files W.F.F. Archive Patent and Equipment Records Communication and Cryptographic Equipment Research, Etx Telewriter, 1949-1951
AFSA-351 Apparatus Memorandum
Letter Concerning A Cryptographic Device Which Apparently Is Capable of A High Degree of Security
Memo Routing Slip and Offer No. 407 for Telecryptic Samples
Memo Routing Slips As76 Under the Name Mr. Friedman
New Hagelin Cipher Machine
Written Notes Under the Name Kurt Ehrat