OIL DRILLING RIG,ZJ70DBS OEM of NOV corporation for 4years core component is imported from America Our brand ... is tiger We are manufacturer and OEM of NOV corporation.Core components of drilling rigs are from America.Product durability ... -DC-ACone to onedrilling rig,oil drilling rig,drill rig,rig,driling machine,oil rig,OIL DRILLING RIG OIL DRILLING RIG,china factory price ...