user: Question: Which entrant was present prior to 1953?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1952.0, 'Ecurie Richmond', 'Cooper T20', 'Bristol Straight-6', 2.0]
SQL:

assistant: SELECT "Entrant" FROM "Table" WHERE "Year" < 1953.0;