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Lightweight vault cover
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Patent number 11,072,904
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Issue date Jul 27, 2021
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Hubbell Incorporated
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Keith Alden Chudley
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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3555979
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Patent number 3,555,979
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Issue date Jan 19, 1971
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3184893
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Patent number 3,184,893
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Issue date May 25, 1965
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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2272382
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Patent number 2,272,382
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Issue date Feb 10, 1942
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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2213169
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Patent number 2,213,169
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Issue date Aug 27, 1940
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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2021313
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Patent number 2,021,313
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Issue date Nov 19, 1935
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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1899474
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Patent number 1,899,474
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Issue date Feb 28, 1933
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING