David D. Cosby

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Fort Worth, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and system for determining plunger location in a plunger lif...
- Patent number 7,819,189
- Issue date Oct 26, 2010
- Harbison-Fischer, L.P.
- David D. Cosby
- E21 - EARTH DRILLING MINING