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2974283
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Patent number 2,974,283
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Issue date Mar 7, 1961
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G01 - MEASURING TESTING
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2638492
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Patent number 2,638,492
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Issue date May 12, 1953
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G01 - MEASURING TESTING
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2560257
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Patent number 2,560,257
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Issue date Jul 10, 1951
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G01 - MEASURING TESTING
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2412070
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Patent number 2,412,070
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Issue date Dec 3, 1946
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G01 - MEASURING TESTING