| 摘要 |
1,182,717. Seaming non-metallic sheet material. PHIPPS & SON (HOLDINGS) Ltd. 27 Aug., 1968 [6 Nov., 1967], No. 50269/67. Addition to 1,011,919. Heading B5K. Elastic webbing is attached to an article or to itself by ultrasonic welding. The specific examples described in Specification 1,011,919 are modified by substituting ultrasonic welding for the welding described therein. The two parts to be welded are pressed together between metal elements and mechanically vibrated to ultrasonic frequencies. |
