Winding up several mainsprings or driving weights simultaneously

Official title: {Winding up several mainsprings or driving weights simultaneously (driving mechanisms with several weights G04B1/06; driving mechanisms with several mainsprings G04B1/12; driving mechanisms with a mainspring and a secondary spring G04B1/225; driving mechanisms with mainsprings and driving weights G04B1/24; winding up the striking mechanisms with the clockwork and vice versa G04B21/14)}

G04B3/008 (Winding up several mainsprings or driving weights simultaneously) appears on 4 US grants and 3 published applications in this corpus.