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F22B23/00—Water-tube boilers built-up from sets of spaced double-walled water tubes of return type in unilateral abutting connection with a boiler drum or with a header box, i.e. built-up from Field water tubes comprising an inner tube arranged within an outer unilaterally-closed tube
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FR21845A1919-11-251919-11-25Perfectionnements aux procédés et appareils pour la vaporisation de l'eau
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