What is United??

Yo guys, i recently built up this bike and i recognized, that i never heard of „United“ before.
Originally it came with a mix of XT 735 and DX, it has Ritchey Dropouts and all in all the frame is pretty light and feels very solid.
So i think it‘s probably not the cheapest shit around but as i googled it and didn‘t found anything, it‘s probably not something premiumish, i guess?

If you have any idea, please let me know in the comments