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3641991
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Patent number 3,641,991
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Issue date Feb 15, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3533196
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Issue date Oct 13, 1970
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B24 - GRINDING POLISHING
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B24 - GRINDING POLISHING
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B28 - WORKING CEMENT, CLAY, OR STONE
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B24 - GRINDING POLISHING