what is the {point in time} for {Charles Coburn} has {award received} as {Academy Award for Best Supporting Actor} ?
When Charles Coburn was presented with the Academy Award for Best Supporting Actor, what was the date?
When did Charles Coburn receive an Academy Award for Best Supporting Actor?
SELECT ?i WHERE { ?s property:award_received resource:Academy_Award_for_Best_Supporting_Actor . resource:Charles_Coburn property:award_received ?s . ?s property:point_in_time ?i }
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} 

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