4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Axially telescoping shaft section

James B. Hebel

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Roller Belleville spring damper

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Weight-on-bit and torque measuring apparatus

Measuring and testing – Borehole or drilling – Downhole test
Patent

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Profile ID: LFUS-PAI-P-351578

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