Question: Which coach of the Minnesota Vikings started prior to 1967?
Answer(s):
answer: Norm Van Brocklin

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.051q5)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.051q5 ns:american_football.football_team.historical_coaching_staff ?y .
?y ns:american_football.football_historical_coach_position.coach ?x .
?x ns:american_football.football_coach.coaching_history ?c .
?c ns:american_football.football_historical_coach_position.from ?num .
FILTER (?num < "1967"^^xsd:dateTime) . 
}