<http://caligraph.org/resource/Oil_field_engine>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Piston_engines> .
<http://caligraph.org/resource/Oil_field_engine>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Engines_by_cylinder_layout> .
<http://caligraph.org/resource/Oil_field_engine>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Piston_engine> .
<http://caligraph.org/resource/Oil_field_engine>	<http://www.w3.org/2002/07/owl#sameAs>	<http://dbpedia.org/resource/Oil_field_engine> .
<http://caligraph.org/resource/Oil_field_engine>	<http://www.w3.org/2000/01/rdf-schema#label>	"Oil field engine" .
<http://caligraph.org/resource/Oil_field_engine>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#NamedIndividual> .
<http://caligraph.org/resource/Oil_field_engine>	<http://www.w3.org/2004/02/skos/core#prefLabel>	"Oil field engine" .