<http://iconclass.org/49L10%28%2B53%29> <http://www.w3.org/2004/02/skos/core#broader> <http://iconclass.org/49L10%28%2B5%29> .
<http://iconclass.org/49L10%28%2B53%29> <http://www.w3.org/2004/02/skos/core#prefLabel> "invention of letters (+ observation ~ scientific research)"@en .
<http://iconclass.org/49L10%28%2B53%29> <http://www.w3.org/2004/02/skos/core#narrower> <http://iconclass.org/49L10%28%2B531%29> .