A solar heat collector made up of several metal plates, each bent to provide a first planar portion and a second planar portion at substantially 90°, with {HEAD ~ a flanged hole} through {TAIL ~ each first portion} 
A solar heat collector made up of several metal plates , each bent to provide a first planar portion and a second planar portion at substantially 90 ° , with { HEAD ~ a flanged hole } through { TAIL ~ each first portion }
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 OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL