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3874223
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Patent number 3,874,223
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Issue date Apr 1, 1975
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G01 - MEASURING TESTING
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3603927
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Patent number 3,603,927
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Issue date Sep 7, 1971
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G01 - MEASURING TESTING
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2990806
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Patent number 2,990,806
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Issue date Jul 4, 1961
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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2911939
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Patent number 2,911,939
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Issue date Nov 10, 1959
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G01 - MEASURING TESTING
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2877735
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Patent number 2,877,735
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Issue date Mar 17, 1959
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT