{HEAD ~ Switches} are provided for producing signals representing a selection of one of the synchronizing device, and {TAIL ~ a control circuit} is responsive to the signals for operating the electric actuator to select one of the synchronizing devices 
{ HEAD ~ Switches } are provided for producing signals representing a selection of one of the synchronizing device , and { TAIL ~ a control circuit } is responsive to the signals for operating the electric actuator to select one of the synchronizing devices
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH