The present invention comprises {HEAD ~ one set} of {TAIL ~ drive gears} and one set of driven gears which are in a constant mesh position 
of
The present invention comprises { HEAD ~ one set } of { TAIL ~ drive gears } and one set of driven gears which are in a constant mesh position
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH