US PATENT SUBCLASS 405 / 135
.~.~ Seal or joint

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

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

DEFINITION

Classification: 405/135

Seal or joint:

(under subclass 134) Method or apparatus wherein means are provided to prevent material passing between adjacent tunnel sections or for coupling the sections to one another or the the completed tunnel.

SEE OR SEARCH CLASS

285, Pipe Joints or Couplings, appropriate subclasses for a pipe seal or joint.