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3902113
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Patent number 3,902,113
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Issue date Aug 26, 1975
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G01 - MEASURING TESTING
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3792347
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Patent number 3,792,347
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Issue date Feb 12, 1974
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E21 - EARTH DRILLING MINING
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3464000
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Patent number 3,464,000
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Issue date Aug 26, 1969
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G01 - MEASURING TESTING
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3262050
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Patent number 3,262,050
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Issue date Jul 19, 1966
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G01 - MEASURING TESTING
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3219921
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Patent number 3,219,921
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Issue date Nov 23, 1965
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G01 - MEASURING TESTING
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3134941
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Patent number 3,134,941
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Issue date May 26, 1964
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E21 - EARTH DRILLING MINING
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3047795
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Patent number 3,047,795
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Issue date Jul 31, 1962
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G01 - MEASURING TESTING