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Grouting method
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Patent number 4,865,782
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Issue date Sep 12, 1989
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Jesse D. Paul
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Grouting machine
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Patent number 4,781,556
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Issue date Nov 1, 1988
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Jesse D. Paul
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES