Its geographic location in the rich tin-bearing valley of the Kinta River made it a natural centre of growth. It grew rapidly as a mining town, especially in the 1920s and 1930s. A local Hakka miner, millionaire Yau Tet-Shin, started developing a large tract of the city in the early 1930s, today known as the 'New Town', from the eastern bank of the Kinta River to Greentown. In 1937, Ipoh was made the capital of Perak, replacing Taiping. Ipoh was invaded by the Japanese on 15 December 1941. In March 1942, the Japanese Civil Administration or Perak Shu Seicho was set up at the St. Michael's Institution. After the liberation of Malaya by British forces, Ipoh remained the capital of Perak, till this day. Two of the largest entertainment groups then, the Cathay Organisation and Shaw Brothers Company, set up cinema chains in Ipoh.