Steering couplings for use between marine engines and propulsion units; hydraulic equipment and components, namely, rotary actuators, linear actuators, valves, platform rotation actuators, mining drill positioners, refuse handlers, and sprayer positioners; fluid powered equipment, namely, hydraulic couplers; fluid powered rotary actuators; fluid powered linear actuators; rotary actuators; hydraulic and pneumatic rotary and linear actuators; machine parts, namely, rotary cylinders and fluid powered cylinders; fluid control valves in the nature of valves used to control rotary actuators; valve operators, namely, hydraulic actuators used to operate valves; counterbalance valves in the nature of valves used to control rotary actuators; construction equipment attachments for use on excavators and backhoes to control the position of work implements; work attachments for use on excavators and backhoes, namely, hydraulically operated buckets; earth moving machine parts, namely, clamshell buckets, grading buckets, trenching buckets, multi purpose buckets; 4-in-1 buckets, hydraulic thumbs, and grapples; actuators which facilitate tilting of work implements attached to land vehicles; work implement positioner for land vehicles

steering control systems for land, air and water vehicles, consisting of rotary actuators; wheel steering actuators for land vehicles, namely, rotary actuators; track steering actuators for land vehicles, namely, rotary actuators