Question: What products were produced by Keyhole, Inc?
Answer(s):
answer: Google Classroom
answer: Google Drive
answer: Apache Wave
answer: Google Earth
answer: Google Buzz
answer: Google Docs, Sheets, and Slides
answer: Nexus S
answer: Google Glass
answer: Nexus 7
answer: Nexus Q
answer: Nexus 10
answer: Google Maps
answer: Chromecast

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:organization.organization.child ?k .
?k ns:organization.organization_relationship.child ns:m.027l9_5 . 
?c ns:business.consumer_company.products ?y .
?y ns:business.company_product_relationship.consumer_product ?x .
FILTER(NOT EXISTS {?y ns:business.company_product_relationship.from_date ?sk0} || 
EXISTS {?y ns:business.company_product_relationship.from_date ?sk1 . 
FILTER(xsd:datetime(?sk1) <= "2015-08-10"^^xsd:dateTime) })
FILTER(NOT EXISTS {?y ns:business.company_product_relationship.to_date ?sk2} || 
EXISTS {?y ns:business.company_product_relationship.to_date ?sk3 . 
FILTER(xsd:datetime(?sk3) >= "2015-08-10"^^xsd:dateTime) })
}