| http://www.w3.org/ns/prov#value | - In a liquid circulating system, a stud having an opening therethrough, a tube projecting from said stud and spaced from the walls of the opening to form a passage around the tube, a filter including an imperforate shell having an inturned flange at one end formed to seal against the stud and defining an opening, a perforated tube connected to said flange, means in the tube to seal against said fir
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