1979 was when which computer was introduced.
Entity Entity
m.0415h71 m.02r3ff6
Explorer/85 PC-8000 Series
class literal
computer.computer 1979^^http://www.w3.org/2001/XMLSchema#gYear
computer.computer type.datetime
Computer 1979
none none
computer.computer.introduced
Introduced
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :computer.computer . 
VALUES ?x1 { "1979-08:00"^^<http://www.w3.org/2001/XMLSchema#gYear> } 
?x0 :computer.computer.introduced ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND computer.computer (JOIN computer.computer.introduced 1979^^http://www.w3.org/2001/XMLSchema#gYear))