I have seen at least 4 style of fans. One has the swash plate air
motor, the Gast vane motor, and 2 oscilating cylinder motors. One
has a belt drive for speed increase (pedistal fan) and the other is
direct drive (ceiling fans).

These are nicely built units and he said that they came from the Amish
in PA. I do not know the manufacturer. I am hoping that someone here
knows.

Bob