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Appareils photomtriques de Dumas. fr Appareils photomtriques de MM Dumas et Regnault pour la vrification du pouvoir clairant du gaz google be pg PA dq pouvoir Aclairantcarcel ei LIFSTpIIoOEwaFfjoBg ct result id YxDAAAAcAAJ hl fr onepage pouvoir Aclairant carcel false Charles Adolphe Wurtz PDold Uploadedwith Gas technologies