Simulative Patents (Class D11/172)
  • Patent number: D252078
    Type: Grant
    Filed: July 12, 1977
    Date of Patent: June 12, 1979
    Inventor: Norbert V. Filliben
  • Patent number: D254607
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: April 1, 1980
    Inventor: William J. Crane
  • Patent number: D257244
    Type: Grant
    Filed: November 24, 1978
    Date of Patent: October 7, 1980
    Inventor: Norbert V. Filliben