4. Rotary shafts, gudgeons, housings, and flexible couplings for ro
  5. Flexible coupling between fluid-conducting rotary shafts
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Stabilizer mechanism for use in drilling deviated well bores

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Flexible coupling between fluid-conducting rotary shafts – Relative angular displacement of axes of shafts
Patent

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Torque control device for rotary mine drilling machine

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Flexible coupling between fluid-conducting rotary shafts – Including member deformable by relative movement between shafts
Patent

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Torque control device for rotary mine drilling machine

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Flexible coupling between fluid-conducting rotary shafts – Including member deformable by relative movement between shafts
Patent

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Torsional shock absorber for a drill string

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Flexible coupling between fluid-conducting rotary shafts – Including member deformable by relative movement between shafts
Reexamination Certificate

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Well tool

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Flexible coupling between fluid-conducting rotary shafts – Including member deformable by relative movement between shafts
Patent

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