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Rudolf Roper
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Dortmund, DE
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last 30 patents
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Patent Grant
Directional drilling tool apparatus and method
Patent number
5,156,222
Issue date
Oct 20, 1992
Baker Hughes Incorporated
Rainer Jurgens
E21 - EARTH DRILLING MINING
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Patent Grant
Auxiliary controlled valve disposed in a drilling string
Patent number
4,519,574
Issue date
May 28, 1985
Norton Christensen, Inc.
Rudolf Roper
E21 - EARTH DRILLING MINING