The mitrailleuse was one of the early types of mechanical machine gun, along with the Gatling, Gardner, Nordenfelt,...

The mitrailleuse was one of the early types of mechanical machine gun, along with the Gatling, Gardner, Nordenfelt, and others. “Mitrailleuse” is actually a general name for a volley gun – one with many barrels in a cluster, which are fired sequentially.…
http://myfusimotors.com/2018/12/09/reffy-mitrailleuse-1867/