Converging Sides In Plan Patents (Class D99/6)
  • Patent number: D251442
    Type: Grant
    Filed: December 22, 1976
    Date of Patent: March 27, 1979
    Assignee: Coal Industry (Patents) Limited
    Inventors: Elvet D. Broom, Peter J. Moxon
  • Patent number: D253975
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: January 15, 1980
    Inventor: Roy D. Brunson
  • Patent number: D258253
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: February 17, 1981
    Inventor: John M. Bleakley