What is {start time} and {end time} of {{Abigail Adams} has {position held} as {Second Lady of the United States}}
On which time period did Abigail Adams serve as the Second Lady of the US?
From when and until when was Abigail Adams Second Lady of the United States?
SELECT ?e ?r WHERE { ?f property:position_held resource:Second_Lady_or_Gentleman_of_the_United_States . resource:Abigail_Adams property:position_held ?f . ?f property:end_time ?r . ?f property:start_time ?e }
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