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