Deployable structural assemblies, systems for deploying such...
Deployable/retractable telescoping mast assembly and method
Derrick having upper and lower crown block positions
Device for erecting and aligning a tilting telescopic mast mount
Device for raising and lowering elongated support structures
Device raising and lowering apparatus
Double cylinder over-center aerial device
Drill mast support assembly
Drilling derrick assembly
Drilling equipment tower raising mechanism
Drilling ramp
Drilling rig
Drilling rig with improved mast support structure
Drilling rig with torque carrier
Dual swing-up elevator well drilling apparatus