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US1606927A
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Method of operating open-hearth furnaces
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US1543909A
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Apparatus for heating air and gases
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US1531649A
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Furnace
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US1564330A
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Open-hearth furnace
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US1531648A
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Method and apparatus for heating air for blast furnaces
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US1543908A
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Method of operating electric furnaces
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US1494225A
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Regenerator
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US1494224A
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Valve for blast furnaces
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US1450668A
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Apparatus for moving furnace electrodes
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US1479429A
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Regulation of electric furnaces
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US1416699A
|
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Tilting furnace
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US1399852A
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Regulator for furnace-electrodes
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US1329588A
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Machine for charging furnaces
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