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1938–1970

In 1938, during Japanese-ruled Korea, Lee Byung-chul (1910–1987) of a large landowning family in the Uiryeong county moved to nearby Daegu city and founded Mitsuboshi Trading Company (株式会社三星商会 (Kabushiki gaisha Mitsuboshi Shōkai)), or Samsung Sanghoe (주식회사 삼성상회). Samsung started out as a small trading company with forty employees located in Su-dong (now Ingyo-dong). It dealt in dried fish, locally-grown groceries and noodles. The company prospered and Lee moved its head office to Seoul in 1947. When the Korean War broke out, he was forced to leave Seoul. He started a sugar refinery in Busan named Cheil Jedang. In 1954, Lee founded Cheil Mojik, a textiles company, and built the first plant in Chimsan-dong, Daegu. It was the largest woollen mill in the country at the time of construction.

Samsung diversified into many different areas. Lee sought to establish Samsung as a leader in a wide range of industries. Samsung moved into lines of business such as insurance, securities, and retail.

In 1947, Cho Hong-jai, the Hyosung group's founder, jointly invested in a new company called Samsung Mulsan Gongsa, or the Samsung Trading Corporation, with the Samsung's founder Lee Byung-chul. The trading firm grew to become the present-day Samsung C&T Corporation. After a few years, Cho and Lee separated due to differences in management style. Cho wanted a 30 equity share. Samsung Group was separated into Samsung Group and Hyosung Group, Hankook Tire and other businesses.

In the late 1960s, Samsung Group entered the electronics industry. It formed several electronics-related divisions, such as Samsung Electronics Devices, Samsung Electro-Mechanics, Samsung Corning and Samsung Semiconductor & Telecommunications, and opened the facility in Suwon. Its first product was a black-and-white television set. Byung-chul was also the owner of the Tongyang Broadcasting Company, a private radio and television company that existed from 1964 to 1980, shut down after the Korean government reviewed the number of media outlets allowed. TBC allowed an early success thanks to its connections to Samsung, boosting the sale of its television sets.