Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F24
HEATING; RANGES; VENTILATING
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F24S
SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
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70/00
Details of absorbing elements
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F24S70/10
characterised by the absorbing material
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F24S70/16
made of ceramic; made of concrete; made of natural stone
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