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3480260
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Patent number 3,480,260
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Issue date Nov 25, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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3456926
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Patent number 3,456,926
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Issue date Jul 22, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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3253533
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Patent number 3,253,533
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Issue date May 31, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3248093
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Patent number 3,248,093
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Issue date Apr 26, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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2841856
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Patent number 2,841,856
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Issue date Jul 8, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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1952464
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Patent number 1,952,464
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Issue date Mar 27, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1767746
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Patent number 1,767,746
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Issue date Jun 24, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1609072
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Patent number 1,609,072
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Issue date Nov 30, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1578021
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Patent number 1,578,021
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Issue date Mar 23, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE