US PATENT SUBCLASS 405 / 140
.~.~ By axially overlapped members

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}
140.~.~ By axially overlapped members

DEFINITION

Classification: 405/140

By axially overlapped members:

(under subclass 138) Method or apparatus wherein a plurality of plates or poles are sequentially driven into the earth surrounding the corridor cross sections such that each plate or pole partially extends over the next longitudinally adjacent plate or pole.