| http://www.w3.org/ns/prov#value | - systems, one of which contains potable water, and the other which contains something that could contaminate the potable water. crown: the sloped top of a masonry chimney designed to shed water away from the flue; also called a splay or a wash. damper: a valve or plate for controlling draft or flow of gases, including air, in a vent or ductwork; a manually-operated plate for controlling draft in a
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