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1828343
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Patent number 1,828,343
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Issue date Oct 20, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1812146
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Patent number 1,812,146
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Issue date Jun 30, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1576678
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Patent number 1,576,678
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Issue date Mar 16, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE