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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27/00
Instantaneous or flash steam boilers
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F22B27/04
built-up from water tubes
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F22B27/08
bent helically, i.e. coiled
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