Twin mainspring barrels
Version vom 8. Februar 2009, 23:38 Uhr von 87.157.229.22 (Diskussion) (Die Seite wurde neu angelegt: '''Twin mainspring barrels''' Two barrels in tandem. Lange's twin mainspring barrels allow the implementation of a progressive power-reserve indication and del...)
Twin mainspring barrels
Two barrels in tandem. Lange's twin mainspring barrels allow the implementation of a progressive power-reserve indication and deliver a power reserve of at least three days.