With Additional Enclosure Structure; E.g., Manhole Patents (Class 52/20)
  • Root cellar
    Patent number: 3938284
    Abstract: A pre-built, transportable root cellar having an open bottom, side walls, an insulated top and air vents.
    Type: Grant
    Filed: October 29, 1974
    Date of Patent: February 17, 1976
    Inventors: Lynn C. Broadbent, William B. Thomas