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Industry

  • CPC
  • G04B37/122
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Current Industry

Patents Grantslast 30 patents

  • Information Patent Grant

    2586641

    • Patent number 2,586,641
    • Issue date Feb 19, 1952
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    2132476

    • Patent number 2,132,476
    • Issue date Oct 11, 1938
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    1775915

    • Patent number 1,775,915
    • Issue date Sep 16, 1930
    • G04 - HOROLOGY

Patents Applicationslast 30 patents