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Automatic rib breaker
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Patent number 4,088,112
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Issue date May 9, 1978
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Martin Concrete Engineering Company
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Henry D. Hight
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B28 - WORKING CEMENT, CLAY, OR STONE
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3811814
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Patent number 3,811,814
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Issue date May 21, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3767746
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Patent number 3,767,746
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Issue date Oct 23, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE