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3918311
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Patent number 3,918,311
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Issue date Nov 11, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3332298
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Issue date Jul 25, 1967
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B60 - VEHICLES IN GENERAL
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3173263
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Patent number 3,173,263
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Issue date Mar 16, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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2880832
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Patent number 2,880,832
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Issue date Apr 7, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2781186
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Patent number 2,781,186
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Issue date Feb 12, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2743798
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Patent number 2,743,798
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Issue date May 1, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2727600
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Patent number 2,727,600
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Issue date Dec 20, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2323753
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Patent number 2,323,753
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Issue date Jul 6, 1943
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B28 - WORKING CEMENT, CLAY, OR STONE
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1805373
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Patent number 1,805,373
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Issue date May 12, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE