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Earth boring, well treating, and oil field chemistry

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
507200000 WELL TREATING 601
507100000 EARTH BORING 287
507090000 PREVENTING CONTAMINANT DEPOSITS IN PETROLEUM OIL CONDUITS 49

Patent applications in class Earth boring, well treating, and oil field chemistry

Patent applications in all subclasses Earth boring, well treating, and oil field chemistry