user: Question: Name the date successor seated for Delegate seat established
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Delaware at-large', 'John Patten (A)', 'Contested election; served until February 14, 1794', 'Henry Latimer (P)', 'Seated February 14, 1794']
SQL:

assistant: SELECT "Date successor seated" FROM "Table" WHERE "Reason for change" = 'Delegate seat established';