The counter shaft is attached at one end to {HEAD ~ a magnet wheel} which communicates with {TAIL ~ a printed circuit board} to ensure accurate advancement of the cover material 
communicates with
The counter shaft is attached at one end to { HEAD ~ a magnet wheel } which communicates with { TAIL ~ a printed circuit board } to ensure accurate advancement of the cover material
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH