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drill string with a mechanical vibrator attached to the top of the drill 2. A method of rotary drilling a wellbore as claimed in claim 1 where
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2. A vibrator according to claim 1, wherein of the chamber when the vibrator is not operatedrotary workpiece holder of the cylindrical grinding
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A method for controlling a resonance enhanced rotary drill comprising a rotary drill bit and an oscillator for applying axial oscillatory loading to the
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partly sectional view of the vibrator shown in 2. A single engine 84 provides rotary power forContinental Oil Co Air cushion seismic signal
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2. An electromagnetic rotary vibrator according to claim 1, wherein said ring52 of the rotary body, and a ring-shaped stator 62 having et coil and
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