US PATENT SUBCLASS 405 / 300
.~.~.~.~.~.~ Paired

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}
299  DF  .~.~.~.~.~ Self-advanceable {1}
300.~.~.~.~.~.~ Paired {1}
301  DF  .~.~.~.~.~.~.~> Nested

DEFINITION

Classification: 405/300

Paired:

(under subclass 299) Method or apparatus wherein two props are laterally connected so that when one prop is in the roof supporting orientation it serves as an anchor for advancing

the other prop.