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3033152
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Issue date May 8, 1962
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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2698104
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Patent number 2,698,104
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Issue date Dec 28, 1954
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E21 - EARTH DRILLING MINING
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744378
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Patent number 744,378
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Issue date Nov 17, 1903
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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738190
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Patent number 738,190
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Issue date Sep 8, 1903
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT