<http://caligraph.org/ontology/Product_introduction>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Introduction> .
<http://caligraph.org/ontology/Product_introduction>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Product_introductions_by_century> .
<http://caligraph.org/ontology/Product_introduction>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Product_introduction>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Product_introductions_by_decade> .
<http://caligraph.org/ontology/Computer-related_introduction>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Product_introduction> .
<http://caligraph.org/ontology/20th-century_television_series_debut>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Product_introduction> .
<http://caligraph.org/ontology/21st-century_television_series_debut>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Product_introduction> .
<http://caligraph.org/ontology/Product_introduction>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Product_introductions_by_year> .
<http://caligraph.org/ontology/Product_introduction>	<http://www.w3.org/2000/01/rdf-schema#label>	"Product introduction" .