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20kHz High-Frequency Ultrasonic Transducer for Ultrasonic Farbric Plastic Welding Machine, Find Details and Price about Ultrasonic Transducer Ultrasonic Welding Transducer from 20kHz High-Frequency Ultrasonic Transducer for Ultrasonic Farbric Plastic Welding Machine - Hangzhou Hanspire Automation Co., Ltd.