query: SELECT ?post ?postLabel ?person ?personLabel ?start_time WHERE {   
    BIND(wd:Q2366737 AS ?cabinet)
    ?post wdt:P361 ?cabinet .
    ?person p:P39 ?position_statement .
    ?position_statement ps:P39 ?post .
    ?position_statement pq:P580 ?start_time .
    FILTER NOT EXISTS { ?position_statement pq:P582 ?end_date } 
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en" . }  
  }
  
  