Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F22
STEAM GENERATION
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F22B
METHODS OF STEAM GENERATION; STEAM BOILERS
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1/00
Methods of steam generation characterised by form of heating method
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F22B1/28
in boilers heated electrically
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F22B1/282
with water or steam circulating in tubes or ducts
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