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US2254809A
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Metal melting furnace
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US1708403A
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Apparatus for making liquid zinc from blue powder
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US1647381A
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Process for making liquid zinc from blue powder
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US1618316A
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Process of electric smelting
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US1715960A
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Condenser for zinc vapors from electric furnaces
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US1535059A
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Process for making liquid zinc from blue powder
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US1537901A
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Device for plugging smelting furnaces
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US1579970A
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Device for charging metallurgical and like furnaces
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US1553011A
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Apparatus for treating materials containing zinc in the metallic state
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US1553646A
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Process for the production of zinc and other volatile metals
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US1525703A
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Electric furnace for the refining of zinc or other volatile metals
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US1508486A
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Device for introduction of the electrodes in electric furnaces
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US1598176A
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Process for the electrothermic production of zinc
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US1579340A
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Method of operation in metallurgical and like processes
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US1417953A
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Electric furnace
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