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3919888
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Patent number 3,919,888
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Issue date Nov 18, 1975
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G01 - MEASURING TESTING
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3864977
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Patent number 3,864,977
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Issue date Feb 11, 1975
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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3048040
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Patent number 3,048,040
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Issue date Aug 7, 1962
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G01 - MEASURING TESTING
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3013234
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Patent number 3,013,234
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Issue date Dec 12, 1961
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G01 - MEASURING TESTING
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2932807
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Patent number 2,932,807
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Issue date Apr 12, 1960
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G01 - MEASURING TESTING
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1791240
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Patent number 1,791,240
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Issue date Feb 3, 1931
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G01 - MEASURING TESTING