AND gates of the power levels for controlling said realized level combinations by controlling positions of {TAIL ~ signal contacts} of the three phase contactors by {HEAD ~ means} of said contactor position lines 
AND gates of the power levels for controlling said realized level combinations by controlling positions of { TAIL ~ signal contacts } of the three phase contactors by { HEAD ~ means } of said contactor position lines
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH