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| US4162966 | 19 Ene 1978 | 31 Jul 1979 | Nalco Chemical Company | Flotation of deep mined coal with water-in-oil emulsions of sodium polyacrylate | | US4222861 | 8 Jun 1978 | 16 Sep 1980 | Nalco Chemical Company | Treatment and recovery of larger particles of fine oxidized coal |
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