I think it is a UL mark that is used for components rather than
complete products.
You are kidding, right? He said NEXT TO THE UL logo...
Ah, my bad. I really need to start reading more carefully.
The mark to the left of the RU looks to me more like a lithographic
registration pattern than a llogo.
Probably logo of the board maker, details and more general useful info on my
reposting to sci.electronics.misc