US PATENT SUBCLASS 405 / 296
.~.~.~.~.~ With rubble shield

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}
288  DF  .~.~ Roof support {5}
290  DF  .~.~.~ Jack {1}
291  DF  .~.~.~.~ Mobile {8}
296.~.~.~.~.~ With rubble shield

DEFINITION

Classification: 405/296

With rubble shield:

(under subclass 291) Method or apparatus wherein means secured to the prop provide protection from falling debris.

(1) Note. The protection means provided for in this subclass must not provide support for the roof.