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:
| Entrant | Constructor | Chassis | Engine | Tyre | Driver | Rounds |
| --- | --- | --- | --- | --- | --- | --- |
| Camoradi International | Behra-Porsche - Porsche | RSK | Porsche 547/6 1.5 F4 | D | Masten Gregory | 1 |
| Camoradi International | Behra-Porsche - Porsche | RSK | Porsche 547/6 1.5 F4 | D | Fred Gamble | 9 |
| Scuderia Centro Sud | Cooper - Maserati | T51 | Maserati 250S 2.5 L4 | D | Roberto Bonomi | 1 |
| Scuderia Centro Sud | Cooper - Maserati | T51 | Maserati 250S 2.5 L4 | D | Carlos Menditeguy | 1 |
| Scuderia Centro Sud | Cooper - Maserati | T51 | Maserati 250S 2.5 L4 | D | Masten Gregory | 2, 4, 6–8 |
| Scuderia Centro Sud | Cooper - Maserati | T51 | Maserati 250S 2.5 L4 | D | Ian Burgess | 2, 6–7, 10 |
| Scuderia Centro Sud | Cooper - Maserati | T51 | Maserati 250S 2.5 L4 | D | Maurice Trintignant | 2, 4, 6, 10 |
| Scuderia Centro Sud | Cooper - Maserati | T51 | Maserati 250S 2.5 L4 | D | Mário de Araújo Cabral | 8 |
| Scuderia Centro Sud | Cooper - Maserati | T51 | Maserati 250S 2.5 L4 | D | Alfonso Thiele | 9 |
| Scuderia Centro Sud | Cooper - Maserati | T51 | Maserati 250S 2.5 L4 | D | Wolfgang von Trips | 10 |
| Giorgio Scarlatti | Maserati | 250F | Maserati 250F1 2.5 L6 | D | Giorgio Scarlatti | 1 |
| Nasif Estéfano | Maserati | 250F | Maserati 250F1 2.5 L6 | D | Nasif Estéfano | 1 |
| Antonio Creus | Maserati | 250F | Maserati 250F1 2.5 L6 | D | Antonio Creus | 1 |
| Gino Munaron | Maserati | 250F | Maserati 250F1 2.5 L6 | D | Gino Munaron | 1 |
| Cooper Car Company | Cooper - Climax | T51 T53 | Climax FPF 2.5 L4 | D | Bruce McLaren | 1–2, 4–8, 10 |
| Cooper Car Company | Cooper - Climax | T51 T53 | Climax FPF 2.5 L4 | D | Jack Brabham | 1–2, 4–8, 10 |
| Cooper Car Company | Cooper - Climax | T51 T53 | Climax FPF 2.5 L4 | D | Chuck Daigh | 7 |
| Cooper Car Company | Cooper - Climax | T51 T53 | Climax FPF 2.5 L4 | D | Lance Reventlow | 7 |
| Cooper Car Company | Cooper - Climax | T51 T53 | Climax FPF 2.5 L4 | D | Ron Flockhart | 10 |
| Team Lotus | Lotus - Climax | 18 16 | Climax FPF 2.5 L4 | D | Innes Ireland | 1–2, 4–8, 10 |
| Team Lotus | Lotus - Climax | 18 16 | Climax FPF 2.5 L4 | D | Alan Stacey | 1–2, 4–5 |
| Team Lotus | Lotus - Climax | 18 16 | Climax FPF 2.5 L4 | D | Alberto Rodriguez Larreta | 1 |
| Team Lotus | Lotus - Climax | 18 16 | Climax FPF 2.5 L4 | D | John Surtees | 2, 7–8, 10 |
| Team Lotus | Lotus - Climax | 18 16 | Climax FPF 2.5 L4 | D | Jim Clark | 4–8, 10 |
| Team Lotus | Lotus - Climax | 18 16 | Climax FPF 2.5 L4 | D | Ron Flockhart | 6 |
| Scuderia Ferrari | Ferrari | 246 | Ferrari 155 2.4 V6 | D | Cliff Allison | 1–2 |
| Scuderia Ferrari | Ferrari | 246 | Ferrari 155 2.4 V6 | D | Phil Hill | 1–2, 4–9 |
| Scuderia Ferrari | Ferrari | 246 | Ferrari 155 2.4 V6 | D | Wolfgang von Trips | 1–2, 4–9 |
| Scuderia Ferrari | Ferrari | 246 | Ferrari 155 2.4 V6 | D | José Froilán González | 1 |
| Scuderia Ferrari | Ferrari | 246 | Ferrari 155 2.4 V6 | D | Richie Ginther | 2, 4, 9 |
| Scuderia Ferrari | Ferrari | 246 | Ferrari 155 2.4 V6 | D | Willy Mairesse | 5–6, 9 |
| Ecurie Bleue | Cooper - Climax | T51 | Climax FPF 2.2 L4 | D | Harry Schell | 1 |
| R.R.C. Walker Racing Team | Lotus - Climax | 18 | Climax FPF 2.5 L4 | D | Stirling Moss | 2, 4–5, 8, 10 |
| R.R.C. Walker Racing Team | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Stirling Moss | 1 |
| R.R.C. Walker Racing Team | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Maurice Trintignant | 1 |
| Owen Racing Organisation | BRM | P25 P48 | BRM P25 2.5 L4 | D | Jo Bonnier | 1–2, 4–8, 10 |
| Owen Racing Organisation | BRM | P25 P48 | BRM P25 2.5 L4 | D | Graham Hill | 1–2, 4–8, 10 |
| Owen Racing Organisation | BRM | P25 P48 | BRM P25 2.5 L4 | D | Dan Gurney | 2, 4–8, 10 |
| Ettore Chimeri | Maserati | 250F | Maserati 250F1 2.5 L6 | D | Ettore Chimeri | 1 |
| Fred Tuck Cars | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Bruce Halford | 2 |
| Fred Tuck Cars | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Lucien Bianchi | 6–7 |
| High Efficiency Motors | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Roy Salvadori | 2, 10 |
| Yeoman Credit Racing Team | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Chris Bristow | 2, 4–5 |
| Yeoman Credit Racing Team | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Tony Brooks | 2, 4–5, 7–8, 10 |
| Yeoman Credit Racing Team | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Henry Taylor | 4, 6–8, 10 |
| Yeoman Credit Racing Team | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Olivier Gendebien | 5–8, 10 |
| Yeoman Credit Racing Team | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Bruce Halford | 6 |
| Yeoman Credit Racing Team | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Phil Hill | 10 |
| J.B. Naylor | JBW - Maserati | 59 | Maserati 250S 2.5 L4 | D | Brian Naylor | 2, 7, 9–10 |
| Scuderia Eugenio Castellotti | Cooper - Castellotti | T51 | Castellotti 2.5 L4 | D | Gino Munaron | 2, 6–7, 9 |
| Scuderia Eugenio Castellotti | Cooper - Castellotti | T51 | Castellotti 2.5 L4 | D | Giorgio Scarlatti | 2, 9 |
| Scuderia Eugenio Castellotti | Cooper - Castellotti | T51 | Castellotti 2.5 L4 | D | Giulio Cabianca | 9 |
| Reventlow Automobiles Inc. | Scarab | F1 | Scarab 2.5 L4 | D | Chuck Daigh | 2, 4–6, 10 |
| Reventlow Automobiles Inc. | Scarab | F1 | Scarab 2.5 L4 | D | Lance Reventlow | 2, 4–5 |
| Reventlow Automobiles Inc. | Scarab | F1 | Scarab 2.5 L4 | D | Richie Ginther | 6 |
| David Brown Corporation | Aston Martin | DBR4 DBR5 | Aston Martin RB6 2.5 L6 | D | Roy Salvadori | 4, 7 |
| David Brown Corporation | Aston Martin | DBR4 DBR5 | Aston Martin RB6 2.5 L6 | D | Maurice Trintignant | 7 |
| Ecurie Maarsbergen | Cooper - Climax | T51 | Climax FPF 1.5 L4 | D | Carel Godin de Beaufort | 4 |
| Taylor-Crawley Racing Team | Lotus - Climax | 18 | Climax FPF 2.5 L4 | D | Mike Taylor | 5 |
| Equipe Nationale Belge | Cooper - Climax | T45 | Climax FPF 2.5 L4 | D | Lucien Bianchi | 5 |
| Vandervell Products | Vanwall | VW 11 | Vanwall 254 2.5 L4 | D | Tony Brooks | 6 |
| Robert Bodle Ltd | Lotus - Climax | 16 | Climax FPF 2.5 L4 | D | David Piper | 6–7 |
| Gilby Engineering | Cooper - Climax | T45 | Maserati 250S 2.5 L4 | D | Keith Greene | 7 |
| C.T. Atkins | Cooper - Climax | T51 | Climax FPF 2.5 L4 | D | Jack Fairman | 7 |
| Arthur Owen | Cooper - Climax | T45 | Climax FPF 2.2 L4 | D | Arthur Owen | 9 |
| Wolfgang Seidel | Cooper - Climax | T45 | Climax FPF 1.5 L4 | D | Wolfgang Seidel | 9 |
| Scuderia Colonia | Cooper - Climax | T43 | Climax FPF 1.5 L4 | D | Piero Drogo | 9 |
| H.H. Gould | Maserati | 250F | Maserati 250F1 2.5 L6 | D | Horace Gould | 9 |
| Dr Ing F. Porsche KG Porsche System Engineering | Porsche | 718/2 | Porsche 547/3 1.5 F4 | D | Edgar Barth | 9 |
| Dr Ing F. Porsche KG Porsche System Engineering | Porsche | 718/2 | Porsche 547/3 1.5 F4 | D | Hans Herrmann | 9 |
| Equipe Prideaux/ Dick Gibson | Cooper - Climax | T43 | Climax FPF 1.5 L4 | D | Vic Wilson | 9 |
| Joe Lubin | Maserati | 250F | Maserati 250S 2.5 L4 | D | Bob Drake | 10 |
| Jim Hall | Lotus - Climax | 18 | Climax FPF 2.5 L4 | D | Jim Hall | 10 |
| Fred Armbruster | Cooper - Climax | T45 | Ferrari 107 2.5 L4 | D | Pete Lovely | 10 |
Question:
What rounds did Roy Salvadori drive for David Brown Corporation?
Answer:
4, 7