4. Boring or penetrating the earth
  5. With signaling, indicating, testing or measuring
  6. Indicating, testing or measuring a condition of the formation
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Lengthening drill string containing an instrument

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

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Logging-while-coring method and apparatus

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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Logging-while-coring method and apparatus

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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Logging-while-drilling apparatus and methods for measuring...

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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