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Disc unit
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Patent number 6,293,354
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Issue date Sep 25, 2001
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Lyle C. Garratt
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Cutting arrangement
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Patent number 4,907,404
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Issue date Mar 13, 1990
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George R. Oliver
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2931444
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Patent number 2,931,444
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Issue date Apr 5, 1960
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2685751
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Patent number 2,685,751
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Issue date Aug 10, 1954
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2560882
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Patent number 2,560,882
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Issue date Jul 17, 1951
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2118851
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Patent number 2,118,851
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Issue date May 31, 1938
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES