US PATENT SUBCLASS 405 / 293
.~.~.~.~.~ With canopy extension

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}
293.~.~.~.~.~ With canopy extension {1}
294  DF  .~.~.~.~.~.~> Telescoping

DEFINITION

Classification: 405/293

With canopy extension:

(under subclass 291) Method or apparatus wherein the roof supporting section of the prop includes means associated therewith which can be projected outwardly from an edge of the section into a roof supporting orientation.