<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_1940s>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_1920s>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_1990s>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_1900s>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/20th-century_introduction> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_1980s>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century>	<http://www.w3.org/2000/01/rdf-schema#label>	"Telecommunications-related introduction in the 20th century" .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_1930s>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Telecommunications-related_introductions_in_the_20th_century> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_1970s>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_1960s>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century> .
<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_1950s>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Telecommunications-related_introduction_in_the_20th_century> .