US PATENT SUBCLASS 405 / 282
.~.~ Trench shoring

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.~.~ Trench shoring {1}
283  DF  .~.~.~> Shield type

DEFINITION

Classification: 405/282

Trench shoring:

(under subclass 272) Method or apparatus pertaining to a temporary bracing to prevent movement of the earthen walls of a longitudinal, horizontal, open topped excavation of indeterminate length.

SEE OR SEARCH THIS CLASS, SUBCLASS:

149, for subject matter relating to tunneling by cut and cover method.