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| Keywords: Electric induction furnace Sheffield.jpg en Wellman electric induction furnace Gröndal Kjellin patents Brightside works Sheffield fr Four à induction de Wellman brevets de Gröndal Kjellin Brightside works Sheffield http //www archive org/details/principlespracti00macfrich California Digital Library 1917 Borvan53 PD-old Images from The principles and practice of iron and steel manufacture by W Macfarlane Induction heating Steel industry in Sheffield Military industries and wartime industrial production in World War I era | ||||
