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