I have some old blue fans, they have the exact same base and blades, but a different cage, logo and center design element. I believe they were KDKs. And you're not lying when you say they're powerful. The 'desk sized' one of my pair easily outperforms standing fans meant for entire rooms. I can't run the bigger one above setting one without getting cold or having stuff blow off my desk.

Funny since even the gradient on the buttons matches.

I'll dig them up for some pictures.