Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 20, 2009
Patent Application Number
11420317
Date Filed
May 25, 2006
Patent Primary Examiner
Patent abstract
A hydraulic switching mechanism for longwall supports. The present invention provides a hydraulic system that is controlled by its own pressure and may be adaptable to those currently in use so that life-threatening and costly faults cannot occur. With the present invention, the retrofitting of existing systems may be made possible without significant expenditure in modification.
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