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3561335
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Patent number 3,561,335
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Issue date Feb 9, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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2644377
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Patent number 2,644,377
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Issue date Jul 7, 1953
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2328888
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Patent number 2,328,888
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Issue date Sep 7, 1943
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2241299
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Patent number 2,241,299
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Issue date May 6, 1941
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2211263
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Patent number 2,211,263
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Issue date Aug 13, 1940
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2195015
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Patent number 2,195,015
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Issue date Mar 26, 1940
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2195221
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Patent number 2,195,221
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Issue date Mar 26, 1940
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2169406
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Patent number 2,169,406
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Issue date Aug 15, 1939
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2169987
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Patent number 2,169,987
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Issue date Aug 15, 1939
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2159509
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Patent number 2,159,509
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Issue date May 23, 1939
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2116468
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Patent number 2,116,468
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Issue date May 3, 1938
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2015707
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Patent number 2,015,707
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Issue date Oct 1, 1935
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES