| http://www.w3.org/ns/prov#value | - If used, the exterior retainer plate and the interior retainer plate may contain one or more apertures 26 through which fluid may flow, arrow F. Exterior retainer plate 22 and interior retainer plate 24 may be constructed of any suitable material, such as plastic, aluminum, steel, ceramic, and so on, with consideration as to the conditions in which they must operate.
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