TREA

John S. Dodson

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  • Cobham, Surrey, GB
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Patents Grantslast 30 patents

  • Information Patent Grant

    Examining a gemstone
    • Patent number 4,529,305
    • Issue date Jul 16, 1985
    • Walter T. Welford
    • G01 - MEASURING TESTING
  • Information Patent Grant

    Centering and working gemstones
    • Patent number 4,417,564
    • Issue date Nov 29, 1983
    • John C. Lawrence
    • B24 - GRINDING POLISHING