After the war, production was slowly returned to civilian use. NEC re-opened its major plants by the end of January 1946 NEC began transistor research and development in 1950. It started exporting radio-broadcast equipment to Korea under the first major postwar contract in 1951. NEC received the Deming Prize for excellence in quality control in 1952. Computer research and development began in 1954. NEC produced the first crossbar switching system in Japan. It was installed at Nippon Telegraph and Telephone Public Corporation (currently Nippon Telegraph and Telephone Corporation; NTT) in 1956. NEC began joint research and development with NTT of electronic switching systems the same year. NEC established Taiwan Telecommunication Company as their first postwar overseas joint venture in 1958. They completed the NEAC-1101 and NEAC-1102 computers the same year. In September 1958, NEC built their first fully transistorized computer, the NEAC-2201, with parts made solely in Japan. One year later, they demonstrated it at the UNESCO AUTOMATH show in Paris. The company began integrated circuit research and development in 1960. In 1963 NEC started trading as American Depositary Receipts, ten million shares being sold in the United States. Nippon Electric New York (now NEC America Inc.) was incorporated in the same year.