TREA

Oscar Kaalstad

Follow

Person

  • Winterpark, FL, US
People

Patents Grantslast 30 patents

  • Information Patent Grant

    Rotary drilling device
    • Patent number 4,832,143
    • Issue date May 23, 1989
    • Cledisc International BV
    • Oscar Kaalstad
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drilling device
    • Patent number 4,790,397
    • Issue date Dec 13, 1988
    • Cledisc International BV
    • Oscar Kaalstad
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Drilling device
    • Patent number 4,549,614
    • Issue date Oct 29, 1985
    • Engtech SA
    • Oscar W. Kaalstad
    • E21 - EARTH DRILLING MINING