Mainsprings; Bridles Therefor (mainsprings With Bridles Subclass 14; Alloys C22c; Springs In General F16f; Constructions For Compensation Of Changes In The Motive Power Of The Mainspring Subclass 18; Construction Of The Hairspring Subclass 111; Arrangements Facilitating The Removal Of The Mainspring Subclass 291) [g04b 1/14] Patents (Class 968/10)