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Portable mini silo system
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Patent number 5,339,996
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Issue date Aug 23, 1994
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Midwest Pre-Mix, Inc.
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Patrick C. Dubbert
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B28 - WORKING CEMENT, CLAY, OR STONE
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3085825
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Patent number 3,085,825
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Issue date Apr 16, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE
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1904906
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Patent number 1,904,906
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Issue date Apr 18, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1904905
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Patent number 1,904,905
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Issue date Apr 18, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE