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| Date | Sunday 20 April 1947 |
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| Event |  Rio GP |
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| Circuit | Gávea |
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| Event Format | Race of 20 laps |
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| Championship | Non-championship |
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| Race number | #4 of 35 in 1947
#33 (of all time) |
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| Laps | 15 |
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| Circuit Perimeter | 10770 m |
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| Race Distance | 10770 × 20 + 45 = 215.445 km (scheduled)
10770 × 15 + 45 = 161.595 km (raced) |
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| Grid Format | Unknown |
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| Pole Position | Unknown |
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| First Corner | Unknown |
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| Entries | 9 |
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| Qualifiers | 7 |
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| Finishers | 4 |
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| Debutants | Chico Landi (Driver),
Gino Bianco (Driver),
Henrique Casini (Driver),
Hélio Ramos (Driver),
João Santos Mauro (Driver),
Luigi Villoresi (Driver),
Rubem Abrunhosa (Driver),
Studebaker (Car Manufacturer),
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Studebaker (Engine Manufacturer),
Alfa Romeo (Car Model),
Maserati (Car Model),
Maserati 6C (Car Model),
Maserati 8CM (Car Model),
Studebaker (Car Model),
Rio GP (Event),
Gávea (Circuit)
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| Milestones | Alfa Romeo – 1st Win (Engine Manufacturer)
Maserati – 1st Pole Position (Engine Manufacturer)
Chico Landi – 1st Win (Driver)
 Alfa Romeo – 1st Win (Car Manufacturer)
Luigi Villoresi – 1st Pole Position (Driver)
Maserati – 1st Pole Position (Car Manufacturer)
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