TREA

Shaffer; John R.

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  • San Jose, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Music training instrument and method
    • Patent number 5,266,735
    • Issue date Nov 30, 1993
    • Shaffer; John R.
    • John R. Shaffer
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS