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Pavement breaking apparatus
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Patent number 4,634,311
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Issue date Jan 6, 1987
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Hercules Machinery Corporation
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John W. Jinnings
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3827410
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Patent number 3,827,410
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Issue date Aug 6, 1974
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2560559
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Patent number 2,560,559
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Issue date Jul 17, 1951
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2545999
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Patent number 2,545,999
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Issue date Mar 20, 1951
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES