... the State Intellectual Property Office(No.ZL200530136401.1),with great power and hydraulic rotary unit, is designed to performas an ... anchor drilling.The instrument could show the real time output power, rotary speed, in-hole pressure andpump pressure, which is ... and high integrationLong feed stroke to prevent the core cloggingGreat power and high torque, suiting for deep hole core drillingHydraulic ...