an electrical power source coupled to said {HEAD ~ light beam scanner} for {TAIL ~ powering} said scanner 
for
an electrical power source coupled to said { HEAD ~ light beam scanner } for { TAIL ~ powering } said scanner
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH