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PCE
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CPC Subgroup
F22B 21/14

involving a single upper drum and two or more lower drums

Full Title

Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically > built-up from substantially-straight water tubes > involving a single upper drum and two or more lower drums

1 direct subcode

Child Classifications

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  • F22B 21/16 the lower drums being interconnected by further water tubes