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Barend Jan Pestman
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Rijswijk, NL
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last 30 patents
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Patent Grant
Earth formation surveying device
Patent number
6,241,029
Issue date
Jun 5, 2001
Shell Research Limited
Josef Guillaume Christoffel Coenen
E21 - EARTH DRILLING MINING
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Patent Grant
Method of determining in-situ stresses
Patent number
6,167,964
Issue date
Jan 2, 2001
Shell Oil Company
Cornelis Jan Kenter
E21 - EARTH DRILLING MINING