Catiga OEM calculator manufacturer... anyone?

[jebem]

In my side of our planet there are a few business stores that are selling one unknown (to me at least) Catiga calculator brand, side by side with Casios and TI's.

One of the Catiga models is the CS-991pr, sold for 9.99 Euro, and it looks suspicious similar to the Casio FX-991es series.

Apparently this is the manufacturer portal. However I'm failing to find a support page where one can get more detailed specifications and the users guide:
http://www.catiga.com.hk/search.asp?index=372

As I can't find too much references in the web, does anyone knows about this Catiga / Casio relationship?