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3739050
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Patent number 3,739,050
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Issue date Jun 12, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3186679
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Patent number 3,186,679
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Issue date Jun 1, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3015144
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Patent number 3,015,144
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Issue date Jan 2, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2591414
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Patent number 2,591,414
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Issue date Apr 1, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2204195
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Patent number 2,204,195
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Issue date Jun 11, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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1437135
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Patent number 1,437,135
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Issue date Nov 28, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE