TREA

Sandvik Ab, Fack & Aktiebolaget SKF

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  • Goteborg, SE
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  • Information Patent Grant

    Rotary drill bit with rotary cutters
    • Patent number 4,263,976
    • Issue date Apr 28, 1981
    • Sandvik AB, Fack & Aktiebolaget SKF
    • Leif Lachonius
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drill bit with rotary cutter
    • Patent number 4,256,193
    • Issue date Mar 17, 1981
    • Sandvik Ab, Fack & Aktiebolaget SKF
    • Heinrich Kunkel
    • E21 - EARTH DRILLING MINING

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