| http://www.w3.org/ns/prov#value | - The method and apparatus find particular utility in the heating and ventilating industry, i.e., in the design and manufacture of air-conditioning ducting, fresh-air or exhaust air ducting, and in the field of conveying fluidized particulate materials, in which industry and in which field custom patterns are required for fittings or other parts on a job-by-job basis and the production run extends t
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