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US2042814A
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Production of manganese dioxide
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US1245137A
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Recovery of metals from ores and the like.
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US1236236A
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Process for the recovery of metals from ores and the like.
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US1231101A
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Process for the recovery of metals from ores and the like.
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CA171772A
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Metal recovery
|
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CA171078A
|
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Metal production
|
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US1207243A
|
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Process for the recovery of metals from ores and the like.
|
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US1188705A
|
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Process for the recovery of metals from ores and the like.
|
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US1146373A
|
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Process for the recovery of metals from ores and the like.
|
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US1144402A
|
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Process for the recovery of metals from ores and the like.
|
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US1163286A
|
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Process of recovering zinc from an acid sulfite solution.
|
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US1111874A
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Process for the treatment of copper ores and the recovery of their values.
|
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US1110660A
|
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Process for arresting sulfurous gases and fumes and utilizing the heat and gases contained therein.
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US1103165A
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Process of rendering smelter-fumes useful and recovery of their values.
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US1085712A
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Apparatus for arresting smelter-fumes and recovering their values.
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