By Means Of Turning Discs (disc-shaped Indicating Devices With A Reference Mark Or A Window Subclass 145; Discs Driven By Clockwork And Producing Optical Special Effects Subclass 382; With Inscriptions Or Drawings Driven By A Clockwork Subclass 384; With Figures Or Parts Of Figures Driven By Clockwork Subclass 386) [g04b 19/20b] Patents (Class 968/163)