Aebi
Alfa Romeo
Bucher
Bührer
Feline
FMC
Forward Racing
Gyrobus
Hess
Hispano-Suiza
Hürlimann
Leblanc
Liebherr
Matech
MOWAG
Peraves
Rigitrac
Rinspeed
Sauber
Saurer
Sbarro
Suter Racing
Suzuki
Weber