query: SELECT ?item WHERE {
    ?item wdt:P195 wd:Q574961 .
    ?item wdt:P31 wd:Q3305213 .  
    OPTIONAL {
      ?item p:P217 ?invstatement .
    ?invstatement ps:P217 ?inv .
    ?invstatement pq:P195 wd:Q574961 .
      }
    } ORDER BY ?inv
  LIMIT 2000