In the preferred embodiments switches are electromagnetic relays; other types of {HEAD ~ switches} suitable for the voltages and {TAIL ~ currents} of the motor circuit, or even digital logic, can be employed in alternative embodiments 
In the preferred embodiments switches are electromagnetic relays ; other types of { HEAD ~ switches } suitable for the voltages and { TAIL ~ currents } of the motor circuit , or even digital logic , can be employed in alternative embodiments
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH