Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F24
HEATING; RANGES; VENTILATING
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F24D
DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
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17/00
Domestic hot-water supply systems
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F24D17/0036
with combination of different kinds of heating means
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F24D17/0063
solar energy and conventional heaters
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F24D17/0068
with accumulation of the heated water
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