4. Boring or penetrating the earth
  5. With tool shaft detail

Anthony Robert Dopf

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Dynamic pressure device for oil drill systems

Measuring and testing – Borehole or drilling – Pressure measurement
Reexamination Certificate

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Subassembly electrical isolation connector for drill rod

Boring or penetrating the earth – With tool shaft detail
Patent

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Subassembly electrical isolation connector for drill rod

Pipe joints or couplings – With casing – lining or protector – Insulated
Reexamination Certificate

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Subassembly electrical isolation connector for drill rod

Boring or penetrating the earth – With tool shaft detail
Patent

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Profile ID: LFUS-PAI-P-379201

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