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3817733
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Patent number 3,817,733
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Issue date Jun 18, 1974
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A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
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3749878
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Patent number 3,749,878
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Issue date Jul 31, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3706543
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Patent number 3,706,543
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Issue date Dec 19, 1972
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A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
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3597578
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Patent number 3,597,578
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Issue date Aug 3, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE