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Sand detector
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Patent number 5,250,807
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Issue date Oct 5, 1993
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Norsk Hydro a.s
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Terje Sontvedt
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G01 - MEASURING TESTING
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3315076
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Patent number 3,315,076
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Issue date Apr 18, 1967
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G01 - MEASURING TESTING
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2811650
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Patent number 2,811,650
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Issue date Oct 29, 1957
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G01 - MEASURING TESTING
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2751506
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Patent number 2,751,506
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Issue date Jun 19, 1956
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G01 - MEASURING TESTING