Table:
text: 1950 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Driver Rounds
Philippe Étancelin Talbot-Lago T26C Eugène Chaboud 6
Ecurie Rosier Talbot-Lago T26C Louis Rosier 2, 7
Ecurie Rosier Talbot-Lago T26C Henri Louveau 7
Cuth Harrison ERA B Cuth Harrison 1-2, 7
Peter Whitehead Ferrari 125 Peter Whitehead 2, 6–7
Scuderia Ferrari Ferrari 125 275 375 Luigi Villoresi 2, 4–5
Scuderia Ferrari Ferrari 125 275 375 Alberto Ascari 2, 4–5, 7
Scuderia Ferrari Ferrari 125 275 375 Raymond Sommer 2, 4
Scuderia Ferrari Ferrari 125 275 375 Dorino Serafini 7
Scuderia Ferrari Ferrari 125 Peter Whitehead 4
Scuderia Milano Maserati 4CLT/50 Felice Bonetto 4
Scuderia Milano Milano-Speluzzi 1 Felice Bonetto 7

text: 1950 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Driver Rounds
Alfa Romeo SpA Alfa Romeo 158/50 Juan Manuel Fangio 1–2, 4–7
Alfa Romeo SpA Alfa Romeo 158/50 Giuseppe Farina 1–2, 4–7
Alfa Romeo SpA Alfa Romeo 158/50 Luigi Fagioli 1–2, 4–7
Alfa Romeo SpA Alfa Romeo 158/50 Reg Parnell 1
Alfa Romeo SpA Alfa Romeo 158/50 Consalvo Sanesi 7
Alfa Romeo SpA Alfa Romeo 158/50 Piero Taruffi 7
Scuderia Ambrosiana Maserati 4CLT/48 David Murray 1, 7
Scuderia Ambrosiana Maserati 4CLT/48 David Hampshire 1, 6
Scuderia Ambrosiana Maserati 4CLT/48 Reg Parnell 6
T.A.S.O. Mathieson ERA E Leslie Johnson 1
Peter Walker ERA E Peter Walker 1

text: 1950 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Driver Rounds
Scuderia Milano Maserati - Milano 4CLT/50 Felice Bonetto 6
Scuderia Milano Maserati - Milano 4CLT/50 Franco Comotti 7
Ecurie Bleue Talbot-Lago T26C Harry Schell 4
Raymond Sommer Talbot-Lago T26C Raymond Sommer 5, 7
Ecurie Lutetia Talbot-Lago T26C Eugène Chaboud 5
Antonio Branca Maserati 4CL Toni Branca 5
Charles Pozzi Talbot-Lago T26C Charles Pozzi 6
Charles Pozzi Talbot-Lago T26C Louis Rosier 6
Clemente Biondetti Ferrari - Jaguar 166S Clemente Biondetti 7
Paul Pietsch Maserati 4CLT/48 Paul Pietsch 7
Guy Mairesse Talbot-Lago T26C Guy Mairesse 7
Pierre Levegh Talbot-Lago T26C Pierre Levegh 7

Question: Which chassis team and driver of the 1950 Formula 1 season had laps of 7 and a participant from Ecurie Rosier?