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Adjustable rotary vibratorMay 2, 1950 N. B. CLEVELAND ADJUSTABLE ROTARY VIBRATOR Filed Oct. 15, 1946 IN V EN TOR. NORMAN B. CLEVELAND Patented May 2

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Well and exploratory drilling apparatus whose rotary motion is modified by a vibrator to provide lateral movement of its bit. There is also disclosed a

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A rotary-vibratory drill coupling has a first component with a plurality of spaced-apart members. Each member has a pair of opposed, spaced-apart faces

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