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Ground surface material
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Patent number 5,088,724
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Issue date Feb 18, 1992
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En-Tout-Cas plc
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Paul Hawkins
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Ground surface material
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Patent number 4,968,024
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Issue date Nov 6, 1990
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En-Tout-Cas plc
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Paul Hawkins
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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