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3031731
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Patent number 3,031,731
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Issue date May 1, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3002227
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Patent number 3,002,227
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Issue date Oct 3, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2765153
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Patent number 2,765,153
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Issue date Oct 2, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2026782
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Patent number 2,026,782
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Issue date Jan 7, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1775735
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Patent number 1,775,735
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Issue date Sep 16, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE