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US Patent Eli Whitney cotton gin. XPatent Cotton Gin Eli Whitney uspto gov piw Docid homeurl Fpatft uspto gov Fnetacgi FnphParser FSect DPTO Sect DHITOFF Fnetahtml Fsearchadv htm DG DPALL DWKUX OS DPN FX RS DPN FX PageNum Rtype SectionNum idkey FFA PDUSGov Usc upload log page history link date username edit summary org php