Who can tell me something about Tsingtao beer? Why are there so many factories and varieties? How can there be pure Lao beer? What happened?

After so many years of development, Tsingtao Brewery naturally has a strong family background, and its production and sales naturally need more factories. In order to continuously meet the market demand, it is natural to introduce various varieties. As for old beer, it is an example. Old beer used to be another factory, but it was later acquired by Tsingtao Brewery, but the brand old beer was retained as a branch product.