| http://www.w3.org/ns/prov#value | - By the construction shown, the ridge sash bars 10, may be made of metal or other suitable strong material, and the valley sash bars 10 are located at a point where they do not obstruct the suns rays from reaching the tanks. 12 designates the corrugated bottom of the case, the corrugations thereof may be of any suitable form or size.
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