| 1948 | Founded as Nanbu Shoko Co., Ltd. in Nihonbashi, Chuo-ku, Tokyo |
 Products of establishment period  Former head office and factory (Nishihara, Shibuya-ku)  Masamichi Taleuchi, the founder of NDK and seed quartz crystal (1963)  Hawk Denshi (now Niigata NDK) |
| 1949 | Started crystal unit production and sales |
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| 1950 | Changed the corporate name to Nihon Dempa Kogyo Co., Ltd. | |
| Relocated Registered Office to Ohyama-cho, Shibuya-ku, Tokyo | ||
| 1954 | Relocated to newly constructed Head Office and Plant in Yoyogi Shin-machi (now Nishihara), Shibuya-ku, Tokyo | |
| 1958 | Succeeded in test production of synthetic quartz crystal | |
| 1959 | Started crystal filter production | |
| 1960 | Started crystal oscillator production | |
| 1962 | Started construction of Sayama Plant in Sayama-city, Saitama | |
| 1963 | Started mass production of synthetic quartz crystal | |
| Began trading of NDK stock on the OTC market | ||
| 1964 | Developed the crystal unit for clock | |
| Opened Kansai Sales Office in Osaka | ||
| 1965 | Started mass production of crystal unit for color TV | |
| Developed the ultrasonic prove | ||
| 1970 | Established Hawk Denshi Co., Ltd., in Niigata (Changed the corporate Name to Niigata NDK Co., Ltd., in 2005) | |
| Developed the temperature-compensated crystal oscillator (TCXO) and the monolithic crystal filter (MCF) |
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