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<http://webisa.webdatacommons.org/379254112>	<http://www.w3.org/ns/prov#value>	"Carbide CorporationLightly cross-linked polyurethane hydrogels based on poly(alkylene ether) polyolsUS3940542Jun 18, 1974Feb 24, 1976Union Carbide CorporationPolyurethane hydrogel fibers and tapes and composites with natural and other synthetic fibers or filmsUS3941858Aug 7, 1973Mar 2, 1976National Patent Development CorporationHydrophilic polymers, articles and methods of making sameUS4202098Feb" .