Variable flow resistance system for use in a subterranean well

Variable flow resistance system with circulation inducing...

Variable force/variable frequency sonic drill head

Variable gauge drilling apparatus and method of assembly...

Variable gauge stabilizer for directional drilling

Variable geometry cluster drill

Variable geometry tiller

Variable height fold and roll staging and method of...

Variable height interlocking moulding strip for flooring

Variable hydraulic resistor jarring tool

Variable length/capacity elevator links

Variable linkage assisted gripper

Variable orifice casing filling apparatus

Variable orifice gas lift valve assembly for high flow rates...

Variable orifice gas lift valve for high flow rates with...

Variable orifice sleeve valve hydraulic jar tool

Variable output hydraulic actuator system

Variable pitch connector

Variable pitch corrugated support surface with accompanying...

Variable pitch rail system