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Manhole
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Patent number 5,899,629
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Issue date May 4, 1999
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Universal Valve Co., Inc.
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Joseph V. Milo
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Manhole
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Patent number 5,785,452
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Issue date Jul 28, 1998
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Universal Valve Co., Inc.
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Joseph V. Milo
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Moveable manhole cover
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Patent number 5,511,898
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Issue date Apr 30, 1996
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Universal Valve Co., Inc.
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Martin C. Pettesch
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING