Olivetti DM 309, Olivetti DM 324, Olivetti DM 409, Olivetti DM 424 Katalóguskód: 15173GPSR: Olivetti S.p.A.; Strada Monte Navale 2/C - 10015 Ivrea (TO) Italy; adminpec@olivetti.telecompost.it; https://www.olivetti.com/
