George B. Witman IV

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Midland, TX, US

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Patents Applicationslast 30 patents

Information Patent Application
Drill bit reservior with controllable relief pressure
- Publication number 20080105467
- Publication date May 8, 2008
- Zhou Yong
- E21 - EARTH DRILLING MINING
Information Patent Application
Cutting structure for single roller cone drill bit
- Publication number 20050178587
- Publication date Aug 18, 2005
- George B. Witman
- E21 - EARTH DRILLING MINING