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Slutted drain
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Patent number 5,564,857
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Issue date Oct 15, 1996
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Contech Construction Products Inc.
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James C. Schluter
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Slotted drain
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Patent number 5,380,121
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Issue date Jan 10, 1995
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Contech Construction Products, Inc.
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James C. Schluter
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES