Drilling, Mining, Or Soil Treatment (includes Element) Patents (Class D15/21)
  • Well drilling vehicle
    Patent number: D244190
    Type: Grant
    Filed: September 2, 1975
    Date of Patent: May 3, 1977
    Assignee: Driltech, Inc.
    Inventors: Richard H. Swartz, Richard J. Pearce, James M. Bowe
  • Cutter head for an ice auger
    Patent number: D250388
    Type: Grant
    Filed: November 24, 1976
    Date of Patent: November 28, 1978
    Inventor: Uuno Rantanen