When did Gansu beef noodles become famous?

Beef noodles, commonly known as "beef Lamian Noodles", are the most distinctive popular economic snacks in Lanzhou. People in Lanzhou are famous for eating beef noodles. According to legend, beef noodles were created by a Hui chef named Ma Baozi during the Guangxu period in the late Qing Dynasty. Later generations bring forth the old and bring forth the new, bringing this noodle culture to the extreme and making it famous all over the world. Nowadays, there are at least one or two beef noodle restaurants in every street and alley in Lanzhou, big or small.