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3616688
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Patent number 3,616,688
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Issue date Nov 2, 1971
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E21 - EARTH DRILLING MINING
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3486380
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Patent number 3,486,380
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Issue date Dec 30, 1969
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E21 - EARTH DRILLING MINING
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3455157
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Patent number 3,455,157
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Issue date Jul 15, 1969
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E21 - EARTH DRILLING MINING
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3184965
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Patent number 3,184,965
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Issue date May 25, 1965
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E21 - EARTH DRILLING MINING
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1519609
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Patent number 1,519,609
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Issue date Dec 16, 1924
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G01 - MEASURING TESTING