Can anyone explain how a commercial ice cream maker is working?

A commercial ice cream machine uses a long cylindrical metal tube as a freezing chamber. A special mix of cream, sugar, milk, and flavorings is poured into holding tanks accessible from the top of the ice cream machine. A certain portion of this mix is drawn into the metallic freezing chambers, which are surrounded by refrigerant lines. An agitator assembly consisting of two spiralling blades also fits precisely inside the freezing chamber. Powerful motors attached to one end of the agitator blades cause them to stir the mix and introduce air for volume and creaminess.\r\n \r\nAs the ice cream mixture becomes more firm, a dispenser unit in the front of the ice cream machine comes into play. The finished ice cream is held in place by a tube connected to a handle. When the handle is raised, ice cream is dispensed into a bowl or cone. Operation of a commercial ice cream machine is foolproof enough to allow customers to dispense their own portions. As long as the ice cream machine is kept filled with ice cream mixture and the freezing chamber is functioning properly, quality ice cream should be available.

That's very interesting, really.\r\nI used to think both home and commercial machines work in the same mannner..