By Displacement Of Devices Carried By The Pendulum Or By Adjusting The Pendulum Length (pendulums And Suspension Subclass 105; Self-adjustment Of The Regulating Lever Subclasses 122, 123, And 509; Adjusting The Stroke Of The Pendulum Subclass 123; Indicating By Acoustic Means Subclass 217; Synchronization With A Standard Clock Subclass 509; Metronome With A Variable Length Subclass 821) [g04b 17/12b] Patents (Class 968/115)