US PATENT SUBCLASS 405 / 138
.~ Boring

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

132  DF  UNDERGROUND PASSAGEWAY, E.G., TUNNEL {6}
138.~ Boring {4}
139  DF  .~.~> With auxiliary tunnel
140  DF  .~.~> By axially overlapped members
141  DF  .~.~> Shield {6}
148  DF  .~.~> Work platform

DEFINITION

Classification: 405/138

Boring:

(under subclass 132) Method or apparatus wherein a subterranean corridor is formed by penetrating an earthen formation without disturbing the overlying earth.

SEE OR SEARCH CLASS

175, Boring or Penetrating the Earth,

62, for a process of boring horizontal bores.