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Method of making slotted pipe
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Method of reconditioning sand filters
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Continuous acid-washed sand filter
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Separation of acid-sludge emulsions
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Hydrolysis of acid sludge
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Petroleum-treating system
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Acid treatment of lubricating oils
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Neutralizing treatment of acid oils for lubricant stocks
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Method of stabilizing clay-treated oils
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Agent for the purification of liquids by adsorption
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Adsorptive agent for the purification of liquids
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Agent for the purification of liquids by adsorption
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Method of preparing an emulsion for the purification of oils
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Process of and apparatus for treating one liquid by another
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Process of purifying petroleum products
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Method of and apparatus for treating one fluid by another
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Method of treating oil
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Method of treating oils
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Process for removing acids from oils
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Method of producing and material for the treatment of oils
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