James R. O'Connell

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Mentor, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Coupling structure for a compound drill stem
- Patent number 4,378,057
- Issue date Mar 29, 1983
- Mining Tools, Div. of Smith Int'l., Inc.
- James R. O'Connell
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mining machine bit and mounting thereof
- Patent number 4,201,421
- Issue date May 6, 1980
- Leroy E. Den Besten
- E21 - EARTH DRILLING MINING