What are some other products of the banks which makes Postbanken?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/product> <http://dbpedia.org/resource/Postbanken> . ?x <http://dbpedia.org/property/products> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Bank>}
Postbanken