Human bone has been utilized for inventing and developing {HEAD ~ medical instruments}, such as dissection drill, {TAIL ~ endoscope} and operation navigator system 
such as
Human bone has been utilized for inventing and developing { HEAD ~ medical instruments } , such as dissection drill , { TAIL ~ endoscope } and operation navigator system
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH