Fecha de publicación: 12/01/1928 Fuente: WIPO "piquera" 267,567. Piquera, J. M. March 15, 1926, [Convention date]. Void [Published under Sect. 91 of the Acts]. Vulcanizing. - In retreading &c. tyres, the beads are gripped between metal rings 1, 4, and a sealing ring 2 of rubber or the like, provided with a valve 3, whereby pressure fluid may be admitted directly to the interior of the tyre, without the need of an air bag &c.