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CHANGE-OVER SYSTEM FOR SWITCHING CONTROL CIRCUITS IN A HYDRAULIC OPERATING SYSTEM OF A HYDRAULIC LIFTING APPARATUS, IN PARTICULAR FOR SWITCHING BETWEEN A CONTROL CIRCUIT OF SUPPORTS AND THAT OF AN OUTRIGGER
CHANGE-OVER SYSTEM FOR SWITCHING CONTROL CIRCUITS IN A HYDRAULIC OPERATING SYSTEM OF A HYDRAULIC LIFTING APPARATUS, IN PARTICULAR FOR SWITCHING BETWEEN A CONTROL CIRCUIT OF SUPPORTS AND THAT OF AN OUTRIGGER