4. Communications, electrical: acoustic wave systems and devices
  5. Seismic prospecting
  6. Land-reflection type

Christopher Durrand

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Centering assembly for an electric downhole connection

Electrical connectors – Having retainer or passageway for fluent material – Fluent material transmission line
Reexamination Certificate

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Downhole sample rate system

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Indicating – testing or measuring a condition of the formation
Reexamination Certificate

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Drill bit assembly with a probe

Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate

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Drill bit assembly with a probe

Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate

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Flexible inductive resistivity device

Inductor devices – With electric and/or magnetic shielding means
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2219043

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