user: Question: Which year is that has a Entrant of Belond Equa-Flow / Calif. Muffler?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1950.0, "Wynn's Friction / Kurtis-Kraft", 'Kurtis Kraft 1000', 'Offenhauser L4', 9.0]
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Entrant" = 'Belond Equa-Flow / Calif. Muffler';