Sensor chips for scientific use; Sensors for determining position, velocity, acceleration and temperature; Sensors for measuring concentrations of chemicals in water; Sensors for the determination of temperatures, positions and distances; Electrical sensor apparatus for sensing the presence or absence of individuals or objects by contact or pressure; Electronic magnetostrictive equipment, namely, a wave generator, wave sensor and wave analyzer; Electronic proximity sensors and switches; Gas sensors for measuring gas concentration; Liquid level sensors; Oil level sensors; Piezoelectric sensors; Pressure sensors; Pressure switches and sensors for monitoring, controlling, and switching hydraulic or pneumatic systems; Surface acoustic wave sensors; Ultrasonic sensors.