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Leonard Valve officially began manufacturing thermostatic mixing valves in 1911, and was incorporated in 1913. The founder, Frederick C. Leonard, was a watch repairman and electrician, among his many talents.
Today, Leonard Valve operates from two facilities in Cranston, Rhode Island, where they have a state-of-the-art machining facility with assembly departments that individually assemble and test each mixing valve and every valve system before shipment.