which developer made the at&t unix parent os?
Entity Entity Entity Entity Entity Entity Entity Entity Entity
m.0179y m.048kc m.09c755 m.0k8z m.02zd460 m.02933 m.04gnf m.0g7522 m.03t4gh
Bell Labs Ken Thompson Richard Stallman Apple Inc. University of California, Berkeley Dennis Ritchie Linus Torvalds Technical Systems Consultants Computer Systems Research Group
class class entity
computer.operating_system_developer computer.operating_system m.07scx
computer.operating_system_developer computer.operating_system computer.operating_system
Operating System Developer Operating System at&t unix
none none none
computer.operating_system_developer.operating_systems_developed computer.operating_system.parent_os
Operating Systems Developed Parent OS
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.operating_system_developer . 
?x1 :type.object.type :computer.operating_system . 
VALUES ?x2 { :m.07scx } 
?x0 :computer.operating_system_developer.operating_systems_developed ?x1 . 
?x1 :computer.operating_system.parent_os ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND computer.operating_system_developer (JOIN computer.operating_system_developer.operating_systems_developed (JOIN computer.operating_system.parent_os m.07scx)))