Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Entrant | Chassis | Engine | Points |
| --- | --- | --- | --- | --- |
| 1952.0 | Scuderia Franera | Frazer-Nash FN48 | Bristol Straight-6 | 3.0 |
| 1952.0 | Scuderia Franera | Frazer-Nash 421 | Bristol Straight-6 | 3.0 |
| 1952.0 | Scuderia Franera | Cooper T20 | Bristol Straight-6 | 3.0 |
| 1953.0 | Ken Wharton | Cooper T23 | Bristol Straight-6 | 0.0 |
| 1954.0 | Owen Racing Organisation | Maserati 250F | Maserati Straight-6 | 0.0 |
| 1955.0 | Vandervell Products Ltd | Vanwall | Vanwall Straight-4 | 0.0 |
Question:
What was the earliest year for a car with 3 points and Cooper t20 chassis?
Answer:
1952.0