| サムネール | 年 | 篇 | タイトル | 内容 | コメント | イメージ | ファイル |
| 1934 | Tokyo Denpa Kenshujo (Tokyo Radio Training Institute) established and founded | Tokyo Denpa Kenshujo (Tokyo Radio Training Institute) established and founded |
| 1949 | Established Toha Kogyo Co., Ltd. and changed its trade name to Tokyo Denpa Co., Ltd. | Established Toha Kogyo Co., Ltd. and changed its trade name to Tokyo Denpa Co., Ltd. |
| 1974 | Kitami Tokyo Denpa Co., Ltd. is established. | Kitami Tokyo Denpa Co., Ltd. is established. |
| 1977 | Gunma Tokyo Denpa Co., Ltd. established | Gunma Tokyo Denpa Co., Ltd. established |
| 1979 | Tokyo Denpa Kikai Co., Ltd. is established. | Tokyo Denpa Kikai Co., Ltd. is established. |
| 1987 | Morioka Tokyo Denpa Co., Ltd. is established. | Morioka Tokyo Denpa Co., Ltd. is established. |
| 1988 | Gunma Tokyo Denpa Co., Ltd. merged with Tokyo Denpa Co., Ltd. | Gunma Tokyo Denpa Co., Ltd. merged with Tokyo Denpa Co., Ltd. |
| 1992 | Tokyo Denpa Equipment Co., Ltd. absorbed by Tokyo Denpa Co., Ltd. | Tokyo Denpa Equipment Co., Ltd. absorbed by Tokyo Denpa Co., Ltd. |
| 1995 | New Kuji Plant of Morioka Tokyo Denpa Co., Ltd. | New Kuji Plant of Morioka Tokyo Denpa Co., Ltd. |
| 2009 | Agreed capital and business alliance with Murata Manufacturing Co., Ltd. | Agreed capital and business alliance with Murata Manufacturing Co., Ltd. |
| 2011 | Concluded comprehensive alliance agreement with Murata Manufacturing Co., Ltd. | Concluded comprehensive alliance agreement with Murata Manufacturing Co., Ltd. |
| 2013 | become a 100% shareholder of Murata Manufacturing Co., Ltd., under a stock swap agreement | become a 100% shareholder of Murata Manufacturing Co., Ltd., under a stock swap agreement |
| 2016 | Morioka Tokyo Denpa Co., Ltd. and Kitami Tokyo Denpa Co., Ltd. merged into Tokyo Denpa Co., Ltd. | Morioka Tokyo Denpa Co., Ltd. and Kitami Tokyo Denpa Co., Ltd. merged into Tokyo Denpa Co., Ltd. |
| 2016 | Tokyo Denpa Co., Ltd. relocated its head office functions from Ota Ward, Tokyo to Morioka City, Iwate Prefecture. | Tokyo Denpa Co., Ltd. relocated its head office functions from Ota Ward, Tokyo to Morioka City, Iwate Prefecture. |
| 2020 | Company name changed to Iwate Murata Manufacturing Co., Ltd. | Company name changed to Iwate Murata Manufacturing Co., Ltd. |
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