What is the {obsolete currencies} for {currency} of {Soviet Union}
What was and is the currency of the Soviet Union?
 select distinct ?obj where { wd:Q15180 wdt:P38 ?obj . ?obj wdt:P31 wd:Q28783456 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q15180> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P38> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q28783456> } 
What was and is the cash of the Soviet Union?