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