.~ Subterranean enclosure with portal opening; e.g., storm or root cellar, bomb shelter
DEFINITION
Classification: 52/169.6
(under subclass 169.1) Structure which is underground and defines an enclosed usable space with portal means at or leading to the earth's surface. Included herein are root cellars, bomb shelters, tornado shelters, underground storage tanks and the like.
SEE OR SEARCH THIS CLASS, SUBCLASS:
19+, for enclosures having horizontal or inclined covers with an entrance for persons or objects.
SEE OR SEARCH CLASS
109, Safes, Bank Protection, or a Related Device, for protective devices of that class.
