Mainly because Lanzhou Lamian Noodles only had the Beef Noodle Industry Association before Lanzhou, and this association was composed of scattered operators, which did not form a brand effect. As a result, Lanzhou Lamian Noodles could not become a registered trademark under the current circumstances, and no one could operate Lanzhou Lamian Noodles as a trademark, so the so-called Lanzhou Lamian Noodles and authentic Lanzhou Lamian Noodles were legal in the whole country. Of course, Lanzhou also has some famous beef noodle brands, such as Mazilu Beef Noodle, China Lanzhou Beef Lamian Noodles and so on. I hope it helps you.