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Concrete strike-off vibrator
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Patent number 4,191,093
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Issue date Mar 4, 1980
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Marshall F. Compton
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Concrete control joint
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Patent number 4,128,358
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Issue date Dec 5, 1978
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Marshall F. Compton
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES