TREA

John C. Watt

Follow

Person

  • Johannesburg, ZA
People

Patents Grantslast 30 patents

  • Information Patent Grant

    Heading shield
    • Patent number 4,420,278
    • Issue date Dec 13, 1983
    • Dowty (South Africa) (Proprietary) Limited
    • Andrew J. Walker
    • E21 - EARTH DRILLING MINING