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