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Publication of BE568212ApublicationCriticalpatent/BE568212A/fr
F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere