Marion E. Heller

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Lewistown, MT, US

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Patents Grantslast 30 patents

Information Patent Grant
Exploration-sampling drilling system
- Patent number 5,213,169
- Issue date May 25, 1993
- Marion E. Heller
- E21 - EARTH DRILLING MINING
Information Patent Grant
Multi-walled drill string for exploration-sampling drilling systems
- Patent number 5,186,266
- Issue date Feb 16, 1993
- Marion E. Heller
- E21 - EARTH DRILLING MINING