YH

Acoustic couplers; Acoustic coupling devices; Acoustic membranes; Acoustic meters; Automatic switching apparatus; Change-over switches; Cut-out switches; Differential switches; Electric buzzers; Electric control panels; Electric current switches; Electric light switches; Electric relays; Electric switch plates; Electric switches; Electrical and electronic burglar alarms; Electrical relays and transformers; Electroacoustic transducers; Electromechanical controls for use in automations; Electronic components, namely, piezoelectric switches; Electronic data relays for sensors; Electronic motion sensitive switches; Electronic motor switches for switching off motors; Electronic touch sensitive switches; High frequency switches; High-frequency switching power supplies; Light switches; Power switches; Solenoid valves; Telecommunication switches; Transducers that utilize ultrasonic oscillations to test for stress and fatigue in metal and metal structures; Transducers that utilize ultrasonic oscillations to treat and reduce stress and fatigue of metals and metal structures