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F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
F22B21/002—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically involving a single upper drum
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FR1149206D1956-02-281956-02-28Perfectionnements à la constitution des tubes field
ExpiredFR1149206A
(fr)