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PRESSOSTATIC RPM CONTROL SYSTEM FOR MOTORS DRIVING HYDRAULIC MEDIUM PUMPS IN PARTICULAR FOR USE ON CIRCULATING PUMPS OF LONG-DISTANCE HEATING MEDIUM TRANSFER SYSTEMS SUCH AS DISTRICT HEATING ONES
PRESSOSTATIC RPM CONTROL SYSTEM FOR MOTORS DRIVING HYDRAULIC MEDIUM PUMPS IN PARTICULAR FOR USE ON CIRCULATING PUMPS OF LONG-DISTANCE HEATING MEDIUM TRANSFER SYSTEMS SUCH AS DISTRICT HEATING ONES