Mining equipment

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E - Fixed Constructions

21

D

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E21D 15/44 (2006.01) E21D 11/00 (2006.01) E21D 15/00 (2006.01) E21D 15/51 (2006.01) E21D 17/00 (2006.01) E21D 23/00 (2006.01) E21D 23/08 (2006.01)

Patent

CA 1041778

Abstract of the Disclosure A self-advancing, hydraulically powered, mine roof support comprises at least one advancing piston and cylinder unit located in or adjacent a base means of the support and attached at or towards the front of the of support to a lifting ram operable along an axis normal to the general plane of the base means. -1-

253117

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