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<http://webisa.webdatacommons.org/383588637>	<http://www.w3.org/ns/prov#value>	"The substrate of the optical information recording medium, with preformed pits and grooves, is generally formed by injection molding, using a thermoplastic resin such as polycarbonate or polymethyl methacrylate." .
<http://webisa.webdatacommons.org/prov/142076977>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/383588637> .
<http://webisa.webdatacommons.org/383588637>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<patents.com> .