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Frank Koehrmann
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Lachendorf, DE
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last 30 patents
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Patent Grant
Drilling and cementing casing system
Patent number
7,234,546
Issue date
Jun 26, 2007
Baker Hughes Incorporated
Ray P. Vincent
E21 - EARTH DRILLING MINING
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last 30 patents
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Patent Application
Drilling and cementing casing system
Publication number
20040003944
Publication date
Jan 8, 2004
Ray P. Vincent
E21 - EARTH DRILLING MINING