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Oil recovery process

by ARGABRIGHT; PERRY A, RHUDY; JOHN S
Year of Publication 28.02.1984
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REGULATION OF IRRIGATION WATER

by BURTON B. SANDIFORD
Year of Publication 11.01.1972
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Flow control apparatus and method

by LUETZELSCHWAB; WAYNE E
Year of Publication 08.11.1988
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Flow control method

by LUETZELSCHWAB; WAYNE E
Year of Publication 19.11.1985
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