TREA

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  • CPC
  • G09B3/12
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Parent Industries

GPHYSICS G09Cryptography, education, displays G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE MODELS PLANETARIA GLOBES MAPS DIAGRAMS G09B3/00Manually or mechanically operated teaching appliances working with questions and answers

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G09B3/12of chart form
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Electronic tide meter, method for calculating a high/low tide time...
    • Patent number 6,295,248
    • Issue date Sep 25, 2001
    • Seiko Instruments Inc.
    • Chiaki Nakamura
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Electric perpetual calendar
    • Patent number 4,694,597
    • Issue date Sep 22, 1987
    • Sheu Kuei-Wen
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Educational device
    • Patent number 4,493,654
    • Issue date Jan 15, 1985
    • Marion W. Stuart
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    1701557
    • Patent number 1,701,557
    • Issue date Feb 12, 1929
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    1668569
    • Patent number 1,668,569
    • Issue date May 8, 1928
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS

Patents Applicationslast 30 patents