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In a mechanism for synchronizing multiple prime movers, a liquid pump, a plurality of hydraulic motors in series therewith, there being a hydraulic motor for each prime mover, differential means associated with each of said prime movers and operable by the difference in relative speeds of said prime movers and said hydraulic motors, and mechanical connecting means positively connecting a speed control member of each of said prime movers with the respective differential means for governing the speed of each of said prime movers.