It may seem odd, but many manufacturers of mah-jongg sets do not identify themselves on their products, or do not brand their sets. This oddity makes it difficult for collectors who want to know who made their sets. In my collecting process, I never got curious enough about manufacturers to go through the tremendous effort to try to learn more.
I guess what I'm trying to say is, I don't care about manufacturing companies. I'm more interested in the gameplay, the history of different variants. So I can't help you with questions about manufacturing companies.
If you are looking for information about who manufactured your mah-jongg set, I recommend you visit these sites: