Matches in DBpedia 2015-10 for { ?s ?p <http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=7&f=G&l=50&co1=AND&d=ptxt&s1=4,438,520&OS=4,438,520&RS=4,438,520> }
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