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Electronic filter
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Patent number 4,510,585
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Issue date Apr 9, 1985
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Geosource Inc.
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Franklin W. Mayo
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H03 - BASIC ELECTRONIC CIRCUITRY
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Borehole survey instrument
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Patent number 4,485,563
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Issue date Dec 4, 1984
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Wilson Industries, Inc.
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Harper E. Sharp
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E21 - EARTH DRILLING MINING
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Cable break locator
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Patent number 4,394,616
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Issue date Jul 19, 1983
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Geosource Inc.
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Edward M. Browne
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G01 - MEASURING TESTING
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