7 Machines for filling bags, in particular open-mouth bags or valve bags, in particular made of paper or plastic, with bulk material; filling machines, with one or more filling spouts, and parts and accessories thereof, as far as included in this class; filling machines with filling spouts arranged in series; rotating filling machines; filling machines equipped with bulk scales; filling machines for liquid materials; machines for feeding empty bags to bag filling machines; empty bag magazines as parts or accessories of bag filling machines; machines for placing empty valve bags on valve bag filling machines; machines and mechanical parts for closing open bags and machines and mechanical parts for closing the valves on valve bags after filling; machines for making open bags; mechanical devices for transferring and feeding bulk materials to filling machines, included in this class