The area underwent rapid industrialization (coal, steel, zinc) in the 19th and the beginning of 20th century. However, it remained a cluster of industrial settlements and villages until the 1950s, when it was administratively united. However, it never developed into a truly unified city.
The area underwent rapid industrialization (coal, steel, zinc) in the 19th and the beginning of 20th century. However, it remained a cluster of industrial settlements and villages until the 1950s, when it was administratively united. However, it never developed into a truly unified city.