<http://caligraph.org/ontology/River-class_minesweeper>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/River-class_minesweeper>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Minesweeper_of_the_Royal_Navy> .
<http://caligraph.org/ontology/River-class_minesweeper>	<http://www.w3.org/2000/01/rdf-schema#label>	"River-class minesweeper" .
<http://caligraph.org/ontology/River-class_minesweeper>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:River-class_minesweepers> .