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Class Information
Number: 405/298
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > Under load advanceable
Description: Method or apparatus wherein the prop is advanced while the roof supporting section remains in its load bearing orientation.

Patents under this class:

Patent Number Title Of Patent Date Issued
5039257 Mine roof supports Aug. 13, 1991
4946316 Method and device for moving a shield-type support trestle Aug. 7, 1990
4939037 Composite sign post Jul. 3, 1990
4747730 Trestle being displaceable on caterpillar May. 31, 1988
4737051 Mobile mine-roof support Apr. 12, 1988
4432673 Mine roof support Feb. 21, 1984
4358224 Continuous sliding support gantry for a large passage Nov. 9, 1982
4348138 Sliding supporting gallery Sep. 7, 1982
4192632 Support systems for mineral mining installations Mar. 11, 1980
4114385 Roof support Sep. 19, 1978
4109473 Roof supports Aug. 29, 1978
4107931 Progressive timbering device Aug. 22, 1978
3952525 Mine roof support Apr. 27, 1976
3943723 Mine roof support equipment Mar. 16, 1976

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