US PATENT SUBCLASS 968 / 292-- .~ With arrangements affording protection of the clockwork against damage as a consequence of a rupture of the mainspring (protection devices against the rupture of the mainspring or its over-tension, placed in the spring-drum or fixed on it against rupture if the mainspring is wound too far subclass 16) [G04B 33/16]

US PATENT SUBCLASS 968 / 292
.~ With arrangements affording protection of the clockwork against damage as a consequence of a rupture of the mainspring (protection devices against the rupture of the mainspring or its over-tension, placed in the spring-drum or fixed on it against rupture if the mainspring is wound too far subclass 16) [G04B 33/16]

968 /	HD	HOROLOGY

284	DD	CALIBERS (disposition of components of the automatic winding mechanism in relation to the clockwork subclass 53) [G04B 33/00] {8}
292		.~ With arrangements affording protection of the clockwork against damage as a consequence of a rupture of the mainspring (protection devices against the rupture of the mainspring or its over-tension, placed in the spring-drum or fixed on it against rupture if the mainspring is wound too far subclass 16) [G04B 33/16]