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Bench top dust collector
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Patent number 5,655,253
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Issue date Aug 12, 1997
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Robert L. Nevin
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B28 - WORKING CEMENT, CLAY, OR STONE
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3749533
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Patent number 3,749,533
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Issue date Jul 31, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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1678064
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Patent number 1,678,064
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Issue date Jul 24, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE