prefix bio: <http://purl.org/vocab/bio/0.1/> 
prefix foaf: <http://xmlns.com/foaf/0.1/> 
prefix time: <http://www.w3.org/2006/time#> 
prefix xsd:  <http://www.w3.org/2001/XMLSchema#>
prefix ex: <http://example.org/ex#> 
prefix thing: <http://example.org/thing#> 

select ?nameBefore ?nameAfter where {
  ?gBefore time:intervalContains ?dateBefore .
  filter (xsd:integer(?dateBefore) <= 1874) .
  
  ?gAfter time:intervalContains ?dateAfter .
  filter (xsd:integer(?dateAfter) > 1874) .

  ?gBefore time:intervalBefore ?gAfter .
  
  graph ?gBefore {
    thing:anon ex:residence ?placeBefore .
  }


  graph ?gAfter {
    thing:anon ex:residence ?placeAfter .
  }

  ?placeBefore foaf:name ?nameBefore .
  ?placeAfter foaf:name ?nameAfter .

}