SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/os> <http://dbpedia.org/resource/Windows_RT> . ?uri <http://dbpedia.org/ontology/product> ?x . }
What is the company that has products with Windows RT as its OS?
SELECT DISTINCT ?o WHERE { ?o property:product ?v . . ?v property:os resource:Windows_R_T }
Microsoft, Microsoft Store
The company that has products with Windows RT as its OS are [Microsoft, Microsoft Store].
A company that has products with Windows RT as an operating system [Microsoft, Microsoft Store].
The company whose product's os is Windows RT are [Microsoft, Microsoft Store].
The company whose operating system is Windows RT is [Microsoft, Microsoft Store].