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Class Information
Number: 405/301
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > Self-advanceable > Paired > Nested
Description: Method or apparatus wherein one prop consists of two laterally spaced rigidly connected sections with the other prop received therebetween.










Patents under this class:

Patent Number Title Of Patent Date Issued
7540693 Method for pillar recovery in chamber-and-pillar working and tubbing unit for pillar recovery Jun. 2, 2009
6910834 Mine prop Jun. 28, 2005
4420278 Heading shield Dec. 13, 1983
4073151 Mine roof support assemblies Feb. 14, 1978











 
 
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