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Prestressed concrete joist
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Patent number 5,671,573
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Issue date Sep 30, 1997
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Board of Regents, University of Nebraska-Lincoln
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Maher K. Tadros
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B28 - WORKING CEMENT, CLAY, OR STONE
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3577504
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Patent number 3,577,504
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Issue date May 4, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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2334355
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Patent number 2,334,355
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Issue date Nov 16, 1943
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E04 - BUILDING
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1764134
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Patent number 1,764,134
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Issue date Jun 17, 1930
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E04 - BUILDING
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1538293
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Patent number 1,538,293
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Issue date May 19, 1925
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E04 - BUILDING