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F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
F24H3/00—Air heaters
F24H3/002—Air heaters using electric energy supply
F24H3/004—Air heaters using electric energy supply with a closed circuit for a heat transfer liquid
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FR823237D1937-06-181937-06-18Appareil de production d'eau chaude ou de vapeur par foyer électrique, appliqué aux radiateurs pour chauffage continu
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