One louver 62 has a solar tracking system mounted to it constructed according to {HEAD ~ the principles} of {TAIL ~ the present invention} 
One louver 62 has a solar tracking system mounted to it constructed according to { HEAD ~ the principles } of { TAIL ~ the present invention }
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 TAIL