... with parallelogram amplitude varying device makes boring tool position rapidly and accurately.3.8 Drilling depth and ... Construction Elevators(multi-speed, stepless-speed), Concrete Mixers (rotary-drum-type, double-horizontal-shaft), Concrete Batchers, Concrete ... oil-burning, gas-burning, coal-burning), Stabilized SoilMixing Plants, Rotary Drilling Rigs... ( function(){ var aBigImageSrc = [ 'http://i01 ...