(under the class definition) Method or apparatus relating to the formation of a subterranean or subaqueous corridor to permit passage of personnel, vehicles, or equipment therethrough.
(1) Note. Patents relating to the subterranean or subaqueous placement of a conduit for conveying fluent material will be found in subclasses 154+.
SEE OR SEARCH THIS CLASS, SUBCLASS:
154+, for subject matter relating to the placement of pipe or cable beneath the surface of the earth or a body of water.
272+, for subject matter relating to shoring and cave-in prevention.
SEE OR SEARCH CLASS
175, Boring or Penetrating the Earth, appropriate subclasses for a process or apparatus for forming a bore in the earth.
299, Mining or In Situ Disintegration of Hard Material, appropriate subclass for a process or apparatus for excavating hard, solid material to form a tunnel. See section V of the class definition of Class 299 for the line. 588, Hazardous or Toxic Waste Destruction or Containment,
249+, for the containment of hazardous or toxic waste in underground areas.
