| http://www.w3.org/ns/prov#value | - The mullion 80 shown in FIGS. 14, 15 is formed of a rugged material such as steel or aluminum, and comprises a base plate 81, a vertical backing plate 82, a forwardly projecting flange 83 at the top of the backing plate 82, and a retaining flange 84 projecting downward a short distance from the top flange 83.
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