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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37/00
Component parts or details of steam boilers
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F22B37/02
applicable to more than one kind or type of steam boiler
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F22B37/10
Water tubes; Accessories therefor
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F22B37/107
Protection of water tubes
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