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3919384
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Patent number 3,919,384
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Issue date Nov 11, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3372445
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Patent number 3,372,445
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Issue date Mar 12, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3038201
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Patent number 3,038,201
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Issue date Jun 12, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE