About: http://webisa.webdatacommons.org/21702754

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	This object can be attained, according to the present invention, by not mixing carbon black in the sheets of surface layers, and fixing carbon black in the intermediate layer or layers other than the surface layers in front and back.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com