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Michael F. Schoettler
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Edmonton, CA
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last 30 patents
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Patent Grant
Method and apparatus for causing pressure variations in a wellbore
Patent number
6,877,566
Issue date
Apr 12, 2005
Richard Selinger
E21 - EARTH DRILLING MINING
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last 30 patents
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Patent Application
Method and apparatus for causing pressure variations in a wellbore
Publication number
20040016549
Publication date
Jan 29, 2004
Richard Selinger
Richard Selinger
E21 - EARTH DRILLING MINING