Question: What was an invention of Benjamin Franklin's that became a product?
Answer(s):
answer: Bifocals

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.019fz)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.019fz ns:law.inventor.inventions ?x .
?x ns:kg.object_profile.prominent_type ns:business.product_category . 
}