4. Earth boring, well treating, and oil field chemistry
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Dobson, Jr. James W.

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Dobson, Sr. Randy Ezell

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Donaldson R. Ashley

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Donche Alain

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Dorf Ketal Speciality Catalysts, LLC

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Dougal Shawn Michael

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Dougherty, III Clifford C.

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Dowell Schlumberger, Inc.

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Dowell, a division of Schlumberger Technology Corporation

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Drabnis Mary H.

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Dreveton Eric

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Duhon, Sr. Jimmy J.

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Duncan William Max

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Duncan, Jr. William M.

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Dunlop Carl

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Durrieu Josiane

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Dyer Richard J.

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