The technological advances that were occurring during this time period, combined with low production costs (e.g. from offshoring activities), resulted in fierce global competition in the semiconductor and electronics manufacturing industries in the last two decades of the twentieth century, helping to drive a continuous price erosion of their products. Market share and revenues of American television and radio manufacturers, for example, decreased precipitously with the success of foreign manufacturers. By the 1980s, imported radio and television receivers (particularly from Japan) dominated the American market. These products were extensively tested by the manufacturers so that, in the eyes of the consumers, the units exhibited higher reliability and better quality at lower prices. Many major American TV and radio manufacturers were forced to exit the business. One-by-one, these companies closed down, sold their assets, or ceased their domestic radio/TV production: Quasar (brand)/Motorola (1974); Magnavox (1974); Admiral (electrical appliances) (1979); GTE (1981), including Sylvania Electric Products and Philco; Curtis Mathes Corporation (1982); General Electric (1985); and RCA (1986). The last U. S. manufacturer to produce television receivers domestically was Zenith Electronics, which sold a controlling interest of its shares to the Korean company LG Electronics in 1995. It became a wholly owned subsidiary of LG in 1999.