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Method for maintaining floors
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Patent number 5,902,411
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Issue date May 11, 1999
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Economics in Technology
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Todd A. Williams
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Abrasive mop head
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Patent number 5,784,746
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Issue date Jul 28, 1998
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Economics in Technology
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Todd A. Williams
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A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
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Mop head
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Patent number D375391
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Issue date Nov 5, 1996
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Economics in Technology
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Todd A. Williams
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D32 - Washing, cleaning, or drying machine
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Mop head
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Patent number D362938
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Issue date Oct 3, 1995
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Economics in Technology
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Todd A. Williams
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D32 - Washing, cleaning, or drying machine