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Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes.
boilers, namely, steam heating boilers, hot water boilers, hydronic boilers, thermal fluid boilers, and oil boilers; water heaters, thermal fluid heaters; components for heating boilers, water heaters, thermal fluid heaters, and oil heaters that are not parts of machines, namely, heat exchangers not being parts of machines