... system for working s tatus of mechanical, electric, hydraulic and pneumatic implements, failure alarm and failure self-diagnosis has been realized ... ×3Drive modeelectric driveelectric driveElectric control modeAC-DC-ACone to onedrilling rig,oil drilling rig,drill rig,rig,driling machine,oil rig,OIL DRILLING RIG OIL DRILLING RIG,china factory price