Fatigue resistant anvil bit for percussion rock drill
Fishing jar for accommodation of excess tensile load
Fishing tool energizer and polymer energy storage element embodi
Floating cushion sub
Flotation means for subsea well riser
Fluid distributor device for down-hole-drills
Fluid dump mechanism
Fluid operated drill apparatus
Fluid operated vibratory jar with rotating bit
Fluid operated vibratory jar with rotating bit
Fluid operated vibratory oil well drilling tool
Fluid operated vibratory oil well drilling tool with anti-chatte
Fluid Powered drilling jar
Fluid powered rotary percussion drill with formation disintegrat
Fluid retarded accelerating jar with negative and positive press