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-
-
3415498
-
Patent number 3,415,498
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Issue date Dec 10, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3379420
-
Patent number 3,379,420
-
Issue date Apr 23, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3249343
-
Patent number 3,249,343
-
Issue date May 3, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3189327
-
Patent number 3,189,327
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Issue date Jun 15, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE