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Replacement eraser for use on lead pencils
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Method of casting metal continuously
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Process for the utilization of ferrous sulfate solutions in the manufacture of ferric alums
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Method for the utilization of spent pickling acid and crude coke works ammonia in the manufacture of ammonium sulfate and iron hydrates or oxides
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Casting iron and steel
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Gas burner for heating the interior of circular vessels
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Reclamation of the fine dust from blast furnaces using manganese ores
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Steel making
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