CREATE TABLE table_16742 ("Race Name" TEXT, "Circuit" TEXT, "Date" TEXT, "Winning driver" TEXT, "Constructor" TEXT, "Report" TEXT)

Who constructed the I Italian Republic Grand Prix?
SELECT "Constructor" FROM table_16742 WHERE "Race Name" = 'I Italian Republic Grand Prix'
SELECT "Constructor" FROM "table_16742" WHERE "Race Name" = 'I Italian Republic Grand Prix'