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Class Information
Number: 405/292
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > Position restoring
Description: Method or apparatus for returning the prop to its initial attitude when it has been relieved of the roof load.










Patents under this class:

Patent Number Title Of Patent Date Issued
7490440 Support device for a rib Feb. 17, 2009
6910834 Mine prop Jun. 28, 2005
6416258 Ground advance shoring system Jul. 9, 2002
5833399 Apparatus for use in forming piles Nov. 10, 1998
5423638 Mine roof supports Jun. 13, 1995
4978248 Advanceable mine roof supports Dec. 18, 1990
4511290 Support frame for underground mining operations Apr. 16, 1985
4474510 Hydraulic mine-roof support Oct. 2, 1984
4324510 Apparatus for supporting a mine roof support assembly Apr. 13, 1982
4268193 Mine roof supports May. 19, 1981
4139326 Mine roof supports Feb. 13, 1979
4117687 Mine roof supports Oct. 3, 1978
3996753 Mine roof support Dec. 14, 1976











 
 
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