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involving a single upper drum and a single lower drum
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Industry
CPC
F22B21/04
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Parent Industries
F
MECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS
F22
Steam generation
F22B
METHODS OF STEAM GENERATION STEAM BOILERS
F22B21/00
Water-tube boilers of vertical or steeply-inclined type
Current Industry
F22B21/04
involving a single upper drum and a single lower drum
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