It is within {HEAD ~ the scope} of {TAIL ~ the present invention} to provide, optionally, reader apparatuses 453 and 459 on the rig 452 
of
It is within { HEAD ~ the scope } of { TAIL ~ the present invention } to provide , optionally , reader apparatuses 453 and 459 on the rig 452
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH