<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:20th-century_American_inventors> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Bulgarian_inventor_or_discoverer> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Bulgarian_inventors> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/2004/02/skos/core#prefLabel>	"Peter Petroff" .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:People_from_Plovdiv_Province> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Bulgarian_emigrant_to_the_United_States> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/List_of_Bulgarians> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/2003_death> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/List_of_inventors> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/1919_birth> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/List_of_Bulgarian_inventors_and_discoverers> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:1919_births> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/20th-century_American_physicist> .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/birthPlace>	<http://caligraph.org/resource/Bulgaria> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Bulgarian_civil_engineers> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Bulgarian> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/2002/07/owl#sameAs>	<http://dbpedia.org/resource/Peter_Petroff> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Person_from_Plovdiv_Province> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:American_mechanical_engineers> .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/deathDate>	"2003-02-27" .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Bulgarian_Americans> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Bulgarian_emigrants_to_the_United_States> .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/birthYear>	"1919" .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/deathYear>	"2003" .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:American_civil_engineers> .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/birthPlace>	<http://caligraph.org/resource/Plovdiv_Province> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Bulgarian_inventor> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/20th-century_American_inventor> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/2000/01/rdf-schema#label>	"Peter Petroff" .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/birthDate>	"1919-10-21" .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Bulgarian_mechanical_engineer> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Bulgarian_mechanical_engineers> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#NamedIndividual> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/American_civil_engineer> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Bulgarian_physicists> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/American_mechanical_engineer> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Bulgarian_scientist> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Bulgarian_scientists_by_century> .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/birthPlace>	<http://caligraph.org/resource/Brestovitsa,_Plovdiv_Province> .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/occupation>	<http://caligraph.org/resource/Invention> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Bulgarian_civil_engineer> .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/deathPlace>	<http://caligraph.org/resource/Huntsville,_Alabama> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:2003_deaths> .
<http://caligraph.org/resource/Peter_Petroff>	<http://caligraph.org/ontology/deathPlace>	<http://caligraph.org/resource/United_States> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Bulgarian_scientists> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Bulgarian_physicist> .
<http://caligraph.org/resource/Peter_Petroff>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:20th-century_American_physicists> .