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Hydrophone assembly
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Patent number 6,725,164
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Issue date Apr 20, 2004
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Input/Output, Inc.
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Eugene D. Bednar
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G01 - MEASURING TESTING
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Geophone checker
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Patent number 5,121,362
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Issue date Jun 9, 1992
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Shell Oil Company
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Eugene D. Bednar
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G01 - MEASURING TESTING
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Hydrophone checker
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Patent number 5,095,464
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Issue date Mar 10, 1992
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Shell Oil Company
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Eugene D. Bednar
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G01 - MEASURING TESTING