What is <replaces> of <abacus> ?
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Which tool replaced the abacus?
SELECT DISTINCT ?t WHERE { ?t property:replaces resource:abacus }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1365> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q12806>. }
select distinct ?answer where { ?answer wdt:P1365 wd:Q12806}