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3724805
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B28 - WORKING CEMENT, CLAY, OR STONE
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Patent number 3,376,010
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Issue date Apr 2, 1968
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E04 - BUILDING
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3328859
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Patent number 3,328,859
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E04 - BUILDING
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E04 - BUILDING
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3182948
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Patent number 3,182,948
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E04 - BUILDING
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Patent number 3,148,429
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B28 - WORKING CEMENT, CLAY, OR STONE
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3129481
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Patent number 3,129,481
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E04 - BUILDING
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2492171
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Patent number 2,492,171
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E04 - BUILDING
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E04 - BUILDING