what is the {point in time} for {3M} has {total revenue} as {2.66e+10} ?
What year did the 3M company pay  a total revenue of 26.6 billion dollars?
What year did the 3M company have a total revenue of 26.6 billion dollars?
SELECT ?d WHERE { FILTER ( CONTAINS ( ?j , '2.66e+10' ) ) . ?t property:point_in_time ?d . ?t property:total_revenue ?j . resource:3M property:total_revenue ?t }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q159433> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2139> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <2.66e+10> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q159433 p:P2139 ?s . ?s ps:P2139 ?x filter(contains(?x , '2.66e+10')) . ?s pq:P585 ?value}