US PATENT SUBCLASS 405 / 137
.~.~ Below bed

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

132  DF  UNDERGROUND PASSAGEWAY, E.G., TUNNEL {6}
136  DF  .~ Subaqueous {1}
137.~.~ Below bed

DEFINITION

Classification: 405/137

Below bed:

(under subclass 136) Method or apparatus wherein the finished tunnel lies entirely below the surface of the earthen formation underlying the body of water.