| 1941 |
 |
Quartz crystal-related business split off from Kinsekisha Hosekiten and was established as an independent company in Setagaya-ku, Tokyo, under the name Kinsekisha Kenkyujo. |
| 1942 |
|
Production of quartz crystal oscillators begins. |
| 1944 |
|
Quartz crystal oscillator with electrodes developed using chemical plating. |
| 1947 |
|
Frequency fine-tuning method for quartz crystal units with electrodes developed using chemical plating. |
| 1949 |
|
Sales division split off to form Kinsekisha Co., Ltd.;
sales branches established in Azabu, Minato-ku, Tokyo and Kyoto City. |
| 1950 |
|
Kinsekisha Kenkyujo Co., Ltd. (now KYOCERA Crystal Device) established with capital of 3 million yen; Professor Hidetsugu Yagi asked to act as advisor; Company approved by Japan Ministry of Electrical Communications as manufacturer of quartz crystal oscillators. |
| 1955 |
|
"The Theory and Practice of Quartz Crystal Oscillators" by Director of Research Division Toshio Shinada, published by Ohmsha, Ltd. |
| 1956 |
|
Production of quartz crystal filters begins. |
| 1957 |
|
Successful development of "barium titanate monocrystal" with guidance from Nippon Telegraph and Telephone Corporation Electrical Communication Research Institute. |
| 1958 |
|
| "Quartz Crystal Unit Pocket Book" published; experiments in growing synthetic quartz crystal successful. |
 |
|
| 1959 |
|
Convex quartz crystal unit developed; GT cut quartz crystal unit delivered to Denpa Kenkyujo; Oki Electric Industry acquires 30,000 shares; phase 1 construction work at Setagaya Plant (Japan) completed; digital frequency counter developed. |
| 1960 |
|
Work on commercialization of synthetic quartz crystal growing commences. |
| 1961 |
|
Tuning fork crystal resonator developed; quartz crystal oscillator unit commercialized; factory established in Asahi City, Chiba Prefecture, Japan. |
| 1962 |
|
Digital frequency counter developed. |
| 1963 |
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Four synthetic quartz crystal growing autoclaves installed at Asahi Plant (Japan) and production commences. |
| 1970 |
|
Success in growing lithium niobate and lithium tantalate monocrystals; construction of Komae Plant (Japan) completed; monolithic crystal filter developed. |
| 1971 |
|
Quartz crystal filter for optical use developed; quartz crystal oscillator for wristwatches developed. |
| 1974 |
|
Quartz crystal units, quartz crystal filters approved by NASDA. |
| 1975 |
|
Hokkaido Kinseki Co., Ltd. established in Mikasa City, Hokkaido Prefecture, Japan. |
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