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Downhole tool
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Patent number 6,289,596
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Issue date Sep 18, 2001
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Andergauge Limited
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Charles Abernethy Anderson
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E21 - EARTH DRILLING MINING
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Borehole dip instrument
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Patent number 5,752,320
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Issue date May 19, 1998
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Borehole Survey Systems Inc.
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Hubert Josef Otte
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E21 - EARTH DRILLING MINING
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Inclinometer
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Patent number 4,578,871
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Issue date Apr 1, 1986
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Oil & Natural Gas Commission
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B. P. Kathel
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E21 - EARTH DRILLING MINING
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Inclination instrument
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Patent number 4,467,526
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Issue date Aug 28, 1984
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Techdel International Inc.
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Hubert J. Otte
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E21 - EARTH DRILLING MINING
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Measuring while drilling tool
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Patent number 4,235,021
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Issue date Nov 25, 1980
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Dresser Industries, Inc.
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Jack R. Claycomb
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E21 - EARTH DRILLING MINING
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Wide angle inclinometer
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Patent number 4,216,590
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Issue date Aug 12, 1980
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BJ-Hughes Inc.
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Robert R. Kelly
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E21 - EARTH DRILLING MINING
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Elastomeric inclinometer
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Patent number 4,069,591
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Issue date Jan 24, 1978
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Sperry-Sun, Inc.
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Billy W. McArthur
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E21 - EARTH DRILLING MINING
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-
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Downhole signaling system
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Patent number 3,964,556
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Issue date Jun 22, 1976
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Gearhart-Owen Industries, Inc.
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Marvin Gearhart
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E21 - EARTH DRILLING MINING
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Cantilever-type inclinometer
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Patent number 3,938,255
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Issue date Feb 17, 1976
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Geolograph Industries
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Henry P. Lichte
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E21 - EARTH DRILLING MINING
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Tiltable coupling
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Patent number 3,930,545
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Issue date Jan 6, 1976
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St. Joe Minerals Corporation
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Howard V. Sears
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E21 - EARTH DRILLING MINING
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3911590
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Patent number 3,911,590
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Issue date Oct 14, 1975
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E21 - EARTH DRILLING MINING
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3908453
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Patent number 3,908,453
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Issue date Sep 30, 1975
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E21 - EARTH DRILLING MINING
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3845569
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Patent number 3,845,569
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Issue date Nov 5, 1974
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E21 - EARTH DRILLING MINING
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3817336
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Patent number 3,817,336
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Issue date Jun 18, 1974
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E21 - EARTH DRILLING MINING
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3803722
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Patent number 3,803,722
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Issue date Apr 16, 1974
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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3791042
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Patent number 3,791,042
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Issue date Feb 12, 1974
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E21 - EARTH DRILLING MINING