US PATENT SUBCLASS 405 / 147
.~.~.~ Seal

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}
147.~.~.~ Seal

DEFINITION

Classification: 405/147

Seal:

(under subclass 141) Method or apparatus including means which prevent the passage of material between a tunnel lining and the shield tail section.