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3612490
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Issue date Oct 12, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3218045
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Patent number 3,218,045
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Issue date Nov 16, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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2858594
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Patent number 2,858,594
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Issue date Nov 4, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2848212
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Patent number 2,848,212
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Issue date Aug 19, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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1677813
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Patent number 1,677,813
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Issue date Jul 17, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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B28 - WORKING CEMENT, CLAY, OR STONE