The holder can be provided with a sheet of abrasive material in order to permit surgical instruments to be cleaned during {HEAD ~ the course} of {TAIL ~ an operation} 
of
The holder can be provided with a sheet of abrasive material in order to permit surgical instruments to be cleaned during { HEAD ~ the course } of { TAIL ~ an operation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL