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US2004334A
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Rotary furnace
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US1992084A
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Production and refining of metals
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US1996342A
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Electrolytic refining and to the casting of anodes and the like
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US1965928A
|
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Method and means for melting and refining metals
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US1877928A
|
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Smelting of metallic ores, particularly copper sulphide ores
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US1850025A
|
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Apparatus for the smelting of copper ores and the like
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US1838427A
|
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Ore reduction
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US1833400A
|
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Liquid circulating plant
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US1753015A
|
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Precipitating system
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US1795663A
|
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Crushing roll
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US1539948A
|
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Driving system for roll-crushing machines
|
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US1591092A
|
|
Sampling apparatus
|
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US1632844A
|
|
Reverberatory-furnace waste-heat boiler
|
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US1523435A
|
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Crushing and separating plant
|
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US1549141A
|
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Apparatus for transporting calcine from roaster furnaces and charging same into reverberatory furnaces
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US1461801A
|
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Apparatus for charging reverberatory furnaces
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US1450980A
|
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Calcine car
|
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US1469327A
|
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Apparatus for charging reverberatory furnaces
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US1535174A
|
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Art of feeding powdered coal to blast furnaces
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US1417538A
|
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Converter plant
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