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drilling
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Reliability Analysis on Friction-Pressurized Drilling Rod of Rotary Drilling Rig
Piezoelectric Actuated Drills Developed at JPL and the Percussive Augmenter of Rotary Drills (PARoD)
Antriebsuntersuchungen beim Rotarybohren
Pumpenantriebe für die Erdölgewinnung aus Bohrlöchern
Dual-Use Technology Program for a Passenger-Cargo Rotorcraft