-
Universal sign post base
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Patent number 8,640,371
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Issue date Feb 4, 2014
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Robert F. Corr
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Utility cover system
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Patent number 7,753,617
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Issue date Jul 13, 2010
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Robert F. Corr
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Utility cover system
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Patent number 7,354,220
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Issue date Apr 8, 2008
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Robert F. Corr
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Utility cover system
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Patent number 6,994,489
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Issue date Feb 7, 2006
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Robert F. Corr
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING