... of ultrasonic principle, the diamond in cloth, leather, plastic, acrylic surface adhesion equipment, portable power transducer, by ultrasonic ... used in riveting, spot welding, embossing, hammer bead plastic technology, etc.4. Beautiful shape, controlled by microcomputer, ... used in riveting, spot welding, embossing, hammer bead plastic technology, etc.4. Beautiful shape, controlled by microcomputer, ...