PATENTE SUIZA DEL 15 DE DICIEMBRE DE 1969
PIEZA DE RELOJERÍA CON BISEL GIRATORIO INTERNO.
Patente publicada el 31 de marzo de 1973 bajo el número 535448
"The case-rim 3 is bearing an internal rim bounded with a ring 8 laid on an internal shoulder-piece of the case-rim 3 by taking an under-shoulder 3a of it, under which it is engaged at peg. An undulated lame-spring 9 interposed between the case-rim 3 and the ring 8 insures a friction of the turning bezel 7 to avoid untimely removal. (...). The arrangement is made in a manner that the rim rotation can only be made in the sense of diver's security and not in the reverse sense. So, whatever sense in which the steam 12 could be untimely manoeuvred while driving, there is no danger for the diver." | 
