TREA

wherein the operative connections between the keys and the type-bars are automatically and continuously permuted, during operation, by a coding or key member

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Industry

  • CPC
  • G09C3/04
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Parent Industries

GPHYSICS G09Cryptography, education, displays G09CCODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY G09C3/00Typewriters for ciphering or deciphering cryptographic text

Current Industry

G09C3/04wherein the operative connections between the keys and the type-bars are automatically and continuously permuted, during operation, by a coding or key member
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Printing and coding machine
    • Patent number 4,155,659
    • Issue date May 22, 1979
    • The United States of America as represented by the Secretary of the Navy
    • Edward S. Larson
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Bowden wire substitute mechanism
    • Patent number 4,141,659
    • Issue date Feb 27, 1979
    • The United States of America as represented by the Secretary of the Navy
    • Berthel F. Madsen
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Mechanical movements for coding machines
    • Patent number 4,124,311
    • Issue date Nov 7, 1978
    • The United States of America as represented by the Secretary of the Navy
    • Albert H. Reiber
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3849599
    • Patent number 3,849,599
    • Issue date Nov 19, 1974
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3752920
    • Patent number 3,752,920
    • Issue date Aug 14, 1973
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS