Power lowering system

Power transmission in double-drum winch

Propulsive-force jack installation for producing the continuous

Pulley lift assembly and curtain system employing same

Pumping ratchet winch

Quick change traveling block

Rack type jacking apparatus

Ratchet type operator for cable winches and the like

Releasable clamping assembly for use with hydraulic jacking appa

Releasable gripper assembly for a jacking mechanism

Rig skidding system

Rope clamping arrangements for sailboats or other applications

Rope or cable winch

Rotary speed limiter device

Safety catch apparatus for a suspension system

Safety device

Safety line and mechanism

Safety lock for a hoisting mechanism that ascends and descends a

Safety locking mechanism for a mechanical lifting jack

Sea swell compensation