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Nihon Dempa Kogyo : ウィキペディア英語版 | Nihon Dempa Kogyo
Nihon Dempa Kogyo Co., Ltd. or () is one of the world's largest Quartz Crystal Companies, based in Shibuya, Tokyo, Japan. Using its synthetic quartz crystals, NDK produces crystal-related products such as crystal devices (e.g. crystal units, crystal oscillators, crystal filters), and also, ultrasonic transducers for medical use. In recent years, the company has begun to develop frequency synthesizers and low-power wireless modules. ==History==
*1948 : NDK was established. *1950 : Started crystal unit production and sales. *1958 : Succeeded in test production of synthetic quartz crystal. *1959 : Started crystal filter production. *1960 : Started crystal oscillator production. *1963 : Began trading of NDK stock on the OTC market. *1979 : Developed and industrialized surface acoustic wave (SAW) filter. *1990 : Listed NDK stock on Second Section of the Tokyo Stock Exchange. *1998 : Listed on the First Section of the Tokyo Stock Exchange.
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