|Photography||supply industry||in Milano, Italia|
|Bencini | Boniforti and Ballerio | Cappelli | Nuova Closter | Ferrania | Filma | Filotecnica Salmoiraghi | GGS | G.P.M. | Industria Scientifica Ottica | Koristka | Lamperti and Garbagnati | Murer & Duroni | Officine Galileo|
GGS was a camera-maker in Milan for a few years after the Second World War. The company was started by Gian Antonio Sommaruga and Carlo Gnecchi, and the company name is derived from their initials.