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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10/00
Solar heat collectors using working fluids
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F24S10/70
the working fluids being conveyed through tubular absorbing conduits
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F24S10/75
with enlarged surfaces, e.g. with protrusions or corrugations
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F24S10/755
the conduits being otherwise bent, e.g. zig-zag
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