PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>

SELECT ?manufacturer (COUNT(?product) AS ?count) 
WHERE {
   ?product rdf:type <http://dbpedia.org/ontology/Device> ;
            	     dbpedia-owl:manufacturer ?manufacturer .
}
GROUP BY ?manufacturer
HAVING (COUNT(?product) > 10)