{HEAD ~ a plurality} of relays adapted for controlling {TAIL ~ power levels} by means of controlling level combinations of said contactors, said relays operated by means of logic gates operating upon desired and actual power levels 
adapted for controlling
{ HEAD ~ a plurality } of relays adapted for controlling { TAIL ~ power levels } by means of controlling level combinations of said contactors , said relays operated by means of logic gates operating upon desired and actual power levels
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH