{HEAD ~ An instrument} is provided for {TAIL ~ working} of surfaces of parts inside engineered cavities by means of a tool, with the possibility of simultaneous viewing of the site of the working operation 
is provided for
{ HEAD ~ An instrument } is provided for { TAIL ~ working } of surfaces of parts inside engineered cavities by means of a tool , with the possibility of simultaneous viewing of the site of the working operation
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL 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 OTH OTH OTH OTH OTH OTH