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GB275778A
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Improvements in or relating to the separation of materials by flotation
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US1581031A
|
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Process of making lead sulphate
|
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GB212355A
|
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Improvements in the construction of tanks and other objects with acid-resisting linings and coverings
|
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GB187313A
|
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Improved process for the production of metallic lead from lead sulphate
|
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GB181239A
|
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Improvements in the treatment of lead-bearing mattes and the like
|
|
GB184628A
|
|
Improvements in the treatment of argentiferous lead-zinc sulphide ores
|
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DE343078C
|
|
Process for the treatment of sulphidic ores containing silver
|
|
GB162026A
|
|
Improvements in the treatment of argentiferous lead-zinc sulphide ores
|
|
GB151698A
|
|
Improvements in the treatment of argentiferous sulphide ores
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