Johann Biehl

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Kirchheim/Teck, DE

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus for the generation of pressure pulses in drilling mud com...
- Patent number 4,901,290
- Issue date Feb 13, 1990
- Eastman Christensen Company
- Dagobert Feld
- E21 - EARTH DRILLING MINING
Information Patent Grant
Core drilling tool with direct drive
- Patent number 4,875,531
- Issue date Oct 24, 1989
- Eastman Christensen Company
- Johann Biehl
- E21 - EARTH DRILLING MINING