... power.3.2 Double motor high-low speed power head ensures efficient drilling-in. 3.3 Frictional ... head—main body from SHANGHAI SAIDA TRANSMISSION EQUIPMENT COMPANY equipped with ITALY BREVINI double speed reductor and with GERMANY REXROTH variable ... -jib, luffing-jib, hammer-head, flat-top, multi-speed, stepless-speed), Construction Elevators(multi-speed, stepless-speed), Concrete Mixers (rotary-drum- ...