Jo Siffert had a ret position and was in a car by Cooper-Maserati in the 1966 French Grand Prix.
[['Jo Siffert', 'POSITION', 'Ret'], ['[TABLECONTEXT]', 'DRIVERS', 'Jo Siffert'], ['Jo Siffert', 'CONSTRUCTOR', 'Cooper-Maserati'], ['[TABLECONTEXT]', '[TITLE]', '1966 French Grand Prix']]