Drilling apparatus

Dual locking linear mechanical lock for high loads

Dual rotating mechanical lock

Dynamic motion limiter

Energy dissipator

Force transmitting coupling

Friction brake arrangement with energizing braking function

Friction lock mechanisms

Heavy load carry slips and method

High efficiency shoes for a jack arrester

High force locking spring

High force locking spring

Hydraulic elevator with plunger brakes

Hydraulic locking device

Hydraulic ram safety device with circular brake

Hydraulically actuated slip assembly

Improved friction lock

Jack arrestor

Linear mechanical lock with one-piece lock housing

Linear motion arresting device