Patents Assigned to SAID David K. Stoltzfus by said Robert G. Ulmer
  • Wood burning furnace
    Patent number: D245509
    Type: Grant
    Filed: March 23, 1976
    Date of Patent: August 23, 1977
    Assignee: SAID David K. Stoltzfus by said Robert G. Ulmer
    Inventors: Robert G. Ulmer, David K. Stoltzfus