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2758726
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Patent number 2,758,726
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Issue date Aug 14, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2276125
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Patent number 2,276,125
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Issue date Mar 10, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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1767443
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Patent number 1,767,443
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Issue date Jun 24, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1766605
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Patent number 1,766,605
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Issue date Jun 24, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1742420
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Patent number 1,742,420
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Issue date Jan 7, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1723447
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Patent number 1,723,447
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Issue date Aug 6, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1698542
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Patent number 1,698,542
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Issue date Jan 8, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1654168
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Patent number 1,654,168
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Issue date Dec 27, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1566301
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Patent number 1,566,301
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Issue date Dec 22, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1535159
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Patent number 1,535,159
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Issue date Apr 28, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1390442
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Patent number 1,390,442
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Issue date Sep 13, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE