How to find a Chinese company past its shell?


I don't know where to post this and nor do I know if anyone would have any idea but its worth a shot.

There is a Chinese company on the mainland that I want to find and get a hold of. I know they are active as they are importing parts into the US but I can't contact them. No number, website, nothing. I have a name and two different address's. I had a Chinese friend try to contact them but she said that it might be shell company becuase there were a lot of business' at that address.

If that is the case. Is there anyway to find them or contact them? They are traders and I know they won't give up their factories but even if I can get a hold of them or even find their factories that would be great.

Does anyone know how to do this?