4. Boring or penetrating the earth
  5. With signaling, indicating, testing or measuring
  6. Indicating, testing or measuring a condition of the formation

M-I L.L.C.

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Additive for increasing the density of a fluid for casing...

Earth boring – well treating – and oil field chemistry – Earth boring – Contains inorganic component other than water or clay
Reexamination Certificate

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Additive for increasing the density of a fluid for casing...

Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component
Reexamination Certificate

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Annular fluids and method of emplacing the same

Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Reexamination Certificate

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Annular fluids and method of emplacing the same

Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component
Reexamination Certificate

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Apparatus and method for separating hydrocarbons from material

Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
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