US Patent for Shovel Patent (Patent # 9,932,722 issued
Apr 24, 2015· Apr 24, 2015 , LTD. A shovel may be provided with a main pump, hydraulic actuators including a swing hydraulic motor, a control valve that controls a flow of a working oil between the main pump and the hydraulic actuators, and two accumulators connected between the swing hydraulic motor and the control valve.