According to the Blue Book of Pool Cues, Karella cues were made since 1993 till 2005 in Thailand for Competition Sports.
So I don't think that they were made by Adam that operated from Japan.
Some of them looked very different then others though. Very different styles, and different style rubber bumpers, if that even says anything about them. Just seems that the brand was made by different factories, and in very different styles, but I do not know. Some were even made for three cushion billiards, with the long wooden joint pin, coming out of the shaft.
I guess that none of that means anything though. They may have still all been made in the same factory.
Some (with just a K logo) were even said to have been made by Joss, lol. I found that one hard to believe though.