US PATENT SUBCLASS 405 / 298
.~.~.~.~.~ Under load advanceable

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}
298.~.~.~.~.~ Under load advanceable

DEFINITION

Classification: 405/298

Under load advanceable:

(under subclass 291) Method or apparatus wherein the prop is advanced while the roof supporting section remains in its load bearing orientation.