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GB383648A
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Process and apparatus for the manufacture of metallic lead
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GB365964A
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Process for converting into soluble salts lead and other metals contained in lead bearing ores
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GB370738A
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Process for the treatment of ores containing lead
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US1950000A
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Process for the treatment of ores containing lead
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US1942208A
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Means for obtaining lead in metallic condition
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US1958699A
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Process for securing compounds of lead
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US1905460A
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Process for converting into soluble salts lead and other metals contained in lead bearing ores
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