| http://www.w3.org/ns/prov#value | - A double fitting for mixing hot and cold water and other liquids in infinitely variable proportions comprises a housing, a first valve operable by a spindle and a coaxial second valve operable by a hollow spindle in said housing, both'valves disposed in the path of cold liquid, and said first valve being arranged to serve as a stop element and said second valve being arranged to serve as a pilot v
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