<http://webisa.webdatacommons.org/prov/50103620>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/339532363> .
<http://webisa.webdatacommons.org/prov/104578964>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/339532363> .
<http://webisa.webdatacommons.org/339532363>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/339532363>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .
<http://webisa.webdatacommons.org/339532363>	<http://www.w3.org/ns/prov#value>	"As can be seen most clearly in FIGS. 21a and 21 b, the drive roll 223 includes a central smooth friction surface 225 formed of a material such as rubber or hard plastic." .