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3013204
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Patent number 3,013,204
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Issue date Dec 12, 1961
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G01 - MEASURING TESTING
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2011665
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Patent number 2,011,665
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Issue date Aug 20, 1935
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G01 - MEASURING TESTING
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2010813
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Patent number 2,010,813
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Issue date Aug 13, 1935
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G01 - MEASURING TESTING
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1976531
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Patent number 1,976,531
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Issue date Oct 9, 1934
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G01 - MEASURING TESTING
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1686676
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Patent number 1,686,676
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Issue date Oct 9, 1928
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G01 - MEASURING TESTING
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1656452
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Patent number 1,656,452
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Issue date Jan 17, 1928
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G01 - MEASURING TESTING