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Directional gamma ray spectrometer

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent

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Doubly-compensated dual-detector density logging apparatus

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent

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Down hole gas analyzer method and apparatus

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate

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Down-hole probe assemblies

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent

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Downhole carbon dioxide gas analyzer

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate

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Downhole device to detect differences in fluid density

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent

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Downhole fluid spectroscopy

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate

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Downhole gamma-ray detection

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate

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Downhole sensing with fiber in exterior annulus

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate

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Dual compensated chlorine logging tool

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate

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Dual detector pulsed neutron logging for providing indication of

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent

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Dual spaced, borehole compensated neutron well logging instrumen

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent

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Dual spectra well logging system and method

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent

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Dual spectra well logging system and method

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent

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