US PATENT SUBCLASS 405 / 142
.~.~.~ With transverse force application feature

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

132  DF  UNDERGROUND PASSAGEWAY, E.G., TUNNEL {6}
138  DF  .~ Boring {4}
141  DF  .~.~ Shield {6}
142.~.~.~ With transverse force application feature

DEFINITION

Classification: 405/142

With transverse force application feature:

(under subclass 141) Method or apparatus wherein the shield is urged into contact with the walls of the corridor surrounding the shield.