US PATENT SUBCLASS 52 / 19
WITH ENTRANCE FOR PERSONS OR OBJECTS IN HORIZONTAL OR INCLINED COVER

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

19WITH ENTRANCE FOR PERSONS OR OBJECTS IN HORIZONTAL OR INCLINED COVER {2}
20  DF  .~> With additional enclosure structure; e.g., manhole
21  DF  .~> Masonry or concrete

DEFINITION

Classification: 52/19

(under the class definition) Structure comprising a horizontal or inclined cover and entrance means defining an opening for persons or objects which pass through the cover.