BALL SCREWS SOLD AS A COMPONENT OF PRECISION MACHINERY; DRIVING SYSTEM FOR INDUSTRIAL EQUIPMENT COMPRISED OF BALL SCREWS, SUPPORTING STAGES AND MOTORS; LINEAR GUIDE WAY FOR PRECISION MACHINERY COMPRISED OF ROLLING ELEMENTS MOVING SYNCHRONOUSLY; X-Y TABLE FOR INDUSTRIAL EQUIPMENT; INDUSTRIAL ROBOT; LINEAR ACTUATOR SYSTEM FOR PRECISION MACHINERY COMPRISED OF DRIVING UNITS AND GUIDING STAGES; LINEAR MOTION GUIDER FOR PRECISION MACHINERY; LINEAR MOTION STAGE FOR USE WITH INDUSTRIAL EQUIPMENT