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Road breaking equipment
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Patent number 5,154,535
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Issue date Oct 13, 1992
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Marvin G. Bays
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Electrical control system
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Patent number 4,802,787
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Issue date Feb 7, 1989
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Mertz, Inc.
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Marvin G. Bays
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Surface crushing apparatus
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Patent number 4,732,506
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Issue date Mar 22, 1988
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Mertz, Inc.
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Marvin G. Bays
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES