Although {HEAD ~ motor} 68 can drive {TAIL ~ elongate member} 30 by any conventional means, a gear system 70 is preferably used 
drive
Although { HEAD ~ motor } 68 can drive { TAIL ~ elongate member } 30 by any conventional means , a gear system 70 is preferably used
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH