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3347532
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Patent number 3,347,532
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Issue date Oct 17, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3218044
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Patent number 3,218,044
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Issue date Nov 16, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3189327
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Patent number 3,189,327
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Issue date Jun 15, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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2320509
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Patent number 2,320,509
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Issue date Jun 1, 1943
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B28 - WORKING CEMENT, CLAY, OR STONE