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