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US924076A
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Process for obtaining pure copper.
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US930967A
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Process of obtaining pure metallic copper from a solution of a salt of copper.
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US930968A
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Process of obtaining pure metallic copper from a solution of a salt of copper.
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US924077A
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Process for obtaining pure metallic copper from a solution of a salt of copper.
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US883961A
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Electrometallurgical process for extracting copper from its ores.
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US883962A
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Process for obtaining pure copper from a solution of copper.
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GB190700703A
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Improved Process for Obtaining Pure Copper.
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GB190700590A
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Improved Process for Extracting Copper from its Ores.
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GB190700591A
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Improved Process of Extracting Copper from its Ores.
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GB190700530A
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Process for Obtaining Pure Copper.
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GB190700414A
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Metallurgical and Electrometallurgical Process for the Production of Pure Copper.
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CA104426A
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Copper extraction
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CA104427A
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Copper extraction
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GB190627120A
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Electrometallurgical Process for Extracting Copper from its Ores.
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Process of obtaining pure copper.
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US885622A
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Process for obtaining pure copper.
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CA100161A
|
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Process of obtaining copper
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US867046A
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Electrometallurgical process for extracting copper from its ores.
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