Table:
text: 1960 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Engine Tyre Driver Rounds
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

text: 1960 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Engine Tyre Driver Rounds
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

Question: What laps did Roy Salvadori set for the David Brown Corporation in their teams and drivers in the 1960 Formula 1 season?