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Acoustic board
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Patent number 6,352,134
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Issue date Mar 5, 2002
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Chao Hsiang Wang
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Highway barrier
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Patent number 6,149,338
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Issue date Nov 21, 2000
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John Derrick Anderson
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Panel for road construction
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Patent number 5,149,061
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Issue date Sep 22, 1992
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Arsenio Borgnini
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Assembly-type barricade
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Patent number 4,854,767
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Issue date Aug 8, 1989
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Just Japan Co., Ltd.
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Mitsuo Sasaki
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES