G.P.M.
| 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 | ||
G.P.M. was the company of Giuseppe Pozzoli in Milano, Italy, the one who produced or marketed the bakelite version the German Sida camera for Italy, holding the official brevetto Italiano 325655 (Italian patent).
