Table:
text: 1951 Swiss Grand Prix
Entries
Entries
No_ Driver Entrant Constructor_ Chassis Engine Tyre_
30 Louis Chiron Enrico Platé Maserati Maserati 4CLT-48 Maserati 4 CL 1.5 L4s P
32 Harry Schell Enrico Platé Maserati Maserati 4CLT-48 Maserati 4 CL 1.5 L4s P
38 Rudi Fischer Ecurie Espadon Ferrari Ferrari 212 Ferrari Type 375 4.5 V12 P
40 Guy Mairesse Yves Giraud-Cabantous Talbot-Lago Talbot-Lago T26C Talbot 23CV 4.5 L6 D
42 José Froilán González José Froilán González Talbot-Lago Talbot-Lago T26C-GS Talbot 23CV 4.5 L6 D
44 Piero Taruffi Scuderia Ferrari Ferrari Ferrari 375 Ferrari Type 375 4.5 V12 P
46 Francis Rochat Francis Rochat Simca-Gordini Simca-Gordini T11 Simca-Gordini 15C 1.5 L4s E
48 Maurice Trintignant Equipe Gordini Simca-Gordini Simca-Gordini T15 Simca-Gordini 15C 1.5 L4s E

Question: How many drivers in the 1951 Swiss Grand Prix used Maserati as their constructor?