Disclosed is {TAIL ~ an electrical control circuit} for controlling current through {HEAD ~ a furnace coil} or other resistive load  
Disclosed is { TAIL ~ an electrical control circuit } for controlling current through { HEAD ~ a furnace coil } or other resistive load
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH