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3797986
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Patent number 3,797,986
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Issue date Mar 19, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3671156
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Patent number 3,671,156
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Issue date Jun 20, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3497580
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Patent number 3,497,580
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Issue date Feb 24, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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2821005
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Patent number 2,821,005
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Issue date Jan 28, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2792613
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Patent number 2,792,613
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Issue date May 21, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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1655898
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Patent number 1,655,898
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Issue date Jan 10, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1596059
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Patent number 1,596,059
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Issue date Aug 17, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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625866
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Patent number 625,866
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Issue date May 30, 1899
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B28 - WORKING CEMENT, CLAY, OR STONE