US PATENT SUBCLASS 405 / 151
.~.~ Panel

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

132  DF  UNDERGROUND PASSAGEWAY, E.G., TUNNEL {6}
150.1  DF  .~ Lining {2}
151.~.~ Panel {2}
152  DF  .~.~.~> With sealing feature
153  DF  .~.~.~> With separate fastening means between adjacent panels

DEFINITION

Classification: 405/151

Panel:

Method or apparatus under subclasses 150.1+ wherein a plurality of complementary, circumferentially arranged segments are assembled together to form the shell.

(1) Note. Bricks are not considered to be panels for this or the indented subclasses. Thus, a tunnel shell which is merely a brick wall will not be found herein.