what is it?

[shade2u2]

I saw an implement for sale that looked like the basic make up of a cultivator, but it has "v shaped" cutting edges loosely attached to the rotating pto driven mechanism by large chain links instead of rotating blades like on a cultivator. It also has a heavy steel cylinder that travels behind these cutting edges. Is this thing a chain harrow or a pulverizer? OR something else. It is an older unit made by Ford & is about 6' wide...