query: SELECT ?item ?inv WHERE {
    ?item p:P195/ps:P195 wd:Q221092 .
    ?item wdt:P31 wd:Q3305213 .
    OPTIONAL { 
     ?item p:P217 
     ?invstatement . 
     ?invstatement ps:P217 ?inv . 
     ?invstatement pq:P195 wd:Q221092 . 
    } 
  } ORDER BY xsd:integer(?inv) LIMIT 2000