Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F23
COMBUSTION APPARATUS; COMBUSTION PROCESSES
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F23B
METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
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80/00
Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
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F23B80/02
by means for returning flue gases to the combustion chamber or to the combustion zone
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