F24VLevel 3

COLLECTION, PRODUCTION OR USE OF HEAT NOT OTHERWISE PROVIDED FOR

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F24V 30/00Apparatus or devices using heat produced by exothermal chemical reactions other than combustion

F24V 40/00Production or use of heat resulting from internal friction of moving fluids or from friction between fluids and moving bodies

F24V 50/00Use of heat from natural sources, e.g. from the sea

F24V 99/00Subject matter not provided for in other main groups of this subclass

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