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<http://webisa.webdatacommons.org/prov/435121064>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/4489643> .
<http://webisa.webdatacommons.org/4489643>	<http://www.w3.org/ns/prov#value>	"U.S. Pat. No. 5,006,394 to Baird teaches a polymeric film structure having a high percentage of fillers, for example, opacifying or whitening agents such as titanium dioxide and calcium carbonate." .
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