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Concrete vibrator machine
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Patent number 4,320,987
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Issue date Mar 23, 1982
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CMI Corporation
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Murray A. Rowe
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Concrete vibrator machine
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Patent number 4,256,415
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Issue date Mar 17, 1981
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CMI Corporation
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Murray A. Rowe
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES