query: SELECT DISTINCT ?item ?inv   WHERE {
    ?item wdt:P195 wd:Q430682 .
    ?item wdt:P31 wd:Q3305213 .
    OPTIONAL {?item p:P217 ?invstatement .
    ?invstatement ps:P217 ?inv .
    ?invstatement pq:P195 wd:Q430682 . }     
    } ORDER BY ?inv
   LIMIT 4000