Telsonic AG - Manufactures and designs equipment for ultrasonic welding, cleaning, sieving, sonochemistry and specialised ultrasonic applications. Switzerland. AmTech (USA) - Manufacture ultrasonic metal welding equipment. Includes good technical information including the theory of ultrasonic welding. Branson Ultrasonics Corporation - Design and manufacture ultrasonic welding equipment for joining, sealing, staking, and degating thermoplastics, as well as linear and orbital vibration welders, hot plate welders, and spin welders. Forward Technology Industries Inc. - Provides ultrasonic and spin welding equipment. Products include hot plate, ultrasonic, spin and vibration welders thermostakers and leak testers . Herrmann Ultraschalltechnik GmbH & Co. KG - Developer and manufacturer of ultrasonic welding equipment for the bonding, laminating and cutting of thermoplastic materials. Includes general section on the principles of ultrasonics. Germany . Sonic & Thermal Technologies, Inc - Manufacturer of ultrasonic welders for plastic welding and heatstaking machinery for insertion, staking, degating and date-coding plastic parts. Ultrasonic horns and free technical bulletins. Strong Ultrasonic Machinery CO., LTD - ultrasonic welding