US PATENT SUBCLASS 405 / 134
.~ Sectional

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

132  DF  UNDERGROUND PASSAGEWAY, E.G., TUNNEL {6}
134.~ Sectional {1}
135  DF  .~.~> Seal or joint

DEFINITION

Classification: 405/134

Sectional:

(under subclass 132) Method or apparatus wherein the tunnel is formed of performed segments each of which is a circumferentially complete portion of the tunnel.