US PATENT SUBCLASS 968 / 291-- .~ Calibers of which the mainsprings or barrels are easily removable (main- springs subclass 10; barrels, arbors subclass 12; normal or mechanical winding subclass 23) [G04B 33/14]

US PATENT SUBCLASS 968 / 291
.~ Calibers of which the mainsprings or barrels are easily removable (main- springs subclass 10; barrels, arbors subclass 12; normal or mechanical winding subclass 23) [G04B 33/14]

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}
291		.~ Calibers of which the mainsprings or barrels are easily removable (main- springs subclass 10; barrels, arbors subclass 12; normal or mechanical winding subclass 23) [G04B 33/14]