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Four à induction pour la préparation de l'acier, avec gouttières de chauffage horizontales et dispositifs pour empecher le laitier de pénétrer dans les gouttières de chauffage
Procédé pour la production de métaux et d'alliages par fusion de composés métallo-acides ou métalloÏdo-acides alcalino-terreux avec des sulfures métalliques et du charbon, dans le four électrique
Method of working flame furnaces, such as furnaces for smelting glass, steel, metals andother materials puddling, welding, heating furnaces andthe like