It is {HEAD ~ a further object} of {TAIL ~ the invention} to provide a change gear system capable of preventing teeth of a rack gear and a pinion to be broken 
of
It is { HEAD ~ a further object } of { TAIL ~ the invention } to provide a change gear system capable of preventing teeth of a rack gear and a pinion to be broken
OTH OTH HEAD 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 OTH OTH OTH OTH OTH OTH OTH