US PATENT SUBCLASS 405 / 283
.~.~.~ Shield type

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

258  DF  EARTH TREATMENT OR CONTROL {5}
272  DF  .~ Shoring, bracing, or cave-in prevention {6}
282  DF  .~.~ Trench shoring {1}
283.~.~.~ Shield type

DEFINITION

Classification: 405/283

Shield type:

(under subclass 282) Method or apparatus wherein the temporary bracing moves with the work as the excavation continues.

SEE OR SEARCH THIS CLASS, SUBCLASS:

141+, for a shield employed specifically in the formation of an underground passageway.