DIFF Subgroup
B31B 50/146 Full Title
Making rigid or semi-rigid containers, e.g. boxes or cartons > Cutting, e.g. perforating, punching, slitting or trimming (cutting window openings B31B50/83)
B31B 50/146 Making rigid or semi-rigid containers, e.g. boxes or cartons > Cutting, e.g. perforating, punching, slitting or trimming (cutting window openings B31B50/83)