4. Boring or penetrating the earth
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deBoer Luc

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Debray Jackson

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Dechief Georges

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Deguchi Shigeru

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Deken Arthur D.

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Dekoster Claude

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Delahoussaye Paul

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Dellinger Thomas B.

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Dengel Nicholas J.

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Derouin Douglas L.

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Desrochers Gerard

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Development Oil Tool Systems

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Diamond Oil Well Drilling

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Diamond Oil Well Drilling Co.

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Dickinson Ben W. O.

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Dickinson Robert W.

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Dickinson Robert W.

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Dickinson Robert Wayne

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Dickinson, III Ben W. O.

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Dickinson, III Ben W. O.

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