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US1983220A
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Method of refining petroleum oil distillates
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Method of producing lubricating oil
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Process of treating lubricating oil stock
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Treatment of petroleum materials
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Method of refining hydrocarbons
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Method of distilling hydrocarbons and producing coke and product thereof
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Method of refining distillates
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Process of cracking and coking
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Ore producing apparatus
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Ore production
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Agitator and filter for treating ores.
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Electrolytic apparatus.
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Hydrocarbon refining method
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