Ball screws sold as a component of precision machinery; Driving system for industrial equipment comprised of ball screws, supporting stages and motors; Linear guideway for precision machinery comprised of rolling elements moving synchronously; Linear motion guider for precision machinery; X-Y table for industrial equipment; Industrial robot; Linear actuator system for precision machinery comprised of driving units and guiding stages; Linear motion stage for use with industrial equipment; Electro-mechanical and electro-hydraulic apparatus, namely, ball screws for transmitting rotary to linear motion; Linear bearing