Preventive maintenance features specific to offset printing machines Emilia Bălan, Liviu Berculescu, Răzvan-George Răcheru, Dorin Vasile Piţigoi and Lucia Adăscăliţa MATEC Web Conf., 343 (2021) 08012 Published online: 04 August 2021 DOI: 10.1051/matecconf/202134308012