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Priority claimed from FR8023787Aexternal-prioritypatent/FR2493968B1/fr
Priority claimed from FR8119454Aexternal-prioritypatent/FR2514869B2/fr
Fornello da riscaldamento a combustibili tradizionali solidi,liquidi o gassosi, con circolazione dei fumi di combustione in controcorrente attraverso condotti ad intercapedine posti esternamente all'isolamento refrattario.