(under the class definition) Subject matter comprising a means positioned over an outdoor aperture through which a person may enter a sewer, boiler, pipe, conduit, drain, or underground or burial chamber.
(1) Note. The means usually acts to prevent outside debris from entering the aperture.
SEE OR SEARCH CLASS
404, Road Structure, Process, or Apparatus,
25+, for a pavement with a load bearing vault cover-closure which may include openings or vents.
