4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Shaft carried guide or protector

Richard Thomas Hay

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Adjustable gauge downhole drilling assembly

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Reexamination Certificate

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Command method for a steerable rotary drilling device

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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Extension assembly for an electromagnetic antenna and method...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2138734

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