Compact casing tongs for use on top head drive earth drilling ma

Device for connecting casings

Device for handling rods for oil-well drilling

Drill pipe connecting and disconnecting apparatus

Drill pipe handling apparatus

Drill stem guide and wrench apparatus

Drill string make-up and break-out mechanism

Drilling rig elevator safety system

Drilling rig, pipe and support apparatus

Equipment for stowing and handling drill pipes

Guide support for rig mounted continuous feed injection unit

Hydraulic drill string breakdown and bleed off unit

Joint compensator

Large diameter flush-joint pipe handling system

Lockdown mechanism for well tools requiring fixed-point packoff

Locking device to load and to screw a drill stem and casing tube

Metal protector for threaded extremities of well drilling tubes

Method and a device for hauling a casing or the like up from a b

Method and apparatus for connecting tubulars using a top drive

Method and apparatus for connecting tubulars using a top drive