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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23/00
Arrangements for concentrating solar-rays for solar heat collectors
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F24S23/31
having discontinuous faces, e.g. Fresnel lenses
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