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·Valve terminal control system [2015-04-01]
·Cold weather workover rig [2015-04-01]
·Desert workover rig [2015-04-01]
·Swamp workover rig [2015-04-01]
·Slant-well workover rig [2015-04-01]
·Mountainous workover rig [2015-04-01]
·Grid-electricity workover rig [2015-04-01]
·HXJ90 [2015-04-01]
·HXJ112 [2015-04-01]
·HXJ135 [2015-04-01]