Ah, I needed that extra "s" (and Google for some reason keeps trying to remove it ). But still, all I can find so far is that Andersson is an in-house brand name for a company called NetOnNet. My guess is that these are re-branded devices from other manufacturers; but, I can't seem to find any info on NetOnNet suppliers.

In any case, if we can determine exactly who manufactures these TVs, we'd have a chance at determining what keyset it requires.