drilling rig,Drilling Rig,30,40,50,70,90DBS,drill rig,factory price,09new style,tech from USADec 21, 2012
... block position, trip speed, safety presetting and interlock protection, and preventing collide up and impact down (crown and RT protection) . with the online monitoring ... for working s tatus of mechanical, electric, hydraulic and pneumatic implements, failure alarm and failure self-diagnosis has been realized, the equipments ... ,50,70,90DBS,drill rig,factory price,09new style,tech from USA