Question: Who was the winning constructor at the circuit of Parioli?
SQL: SELECT "Winning constructor" FROM "2-12631771-2" WHERE "Circuit" = 'Parioli';

Question: When did Gaspare Bona win the Pozzo Circuit?
SQL: SELECT "Date" FROM "2-12631771-2" WHERE "Winning driver" = 'Gaspare Bona' AND "Name" = 'Pozzo Circuit';

Question: Who was the winning constructor of the Grand Prix du Salon ?
SQL: SELECT "Winning constructor" FROM "2-12631771-2" WHERE "Name" = 'Grand Prix du Salon';

Question: Which circuit did François Eysermann win ?
SQL: SELECT "Circuit" FROM "2-12631771-2" WHERE "Winning driver" = 'François Eysermann';