| 1948-07 |
Founded Nippon Electric Welding Equipment Co., Ltd. in Tokyo Iinfunamachi (now Shintomicho) |
| 1959-03 |
Developed and started production of Japan's first high-speed engine welder |
| 1961-12 |
Completed Saitama factory and began production of engine generators |
| 1966-02 |
Developed noise reduction devices and adopted them for engine generators and engine welders |
| 1966-07 |
Changed company name to Denyo Co., Ltd. |
| 1970-07 |
Completed Shiga factory and started production |
| 1973-04 |
Started production of engine compressors |
| 1976-03 |
Established joint venture P.T. Denyo Indonesia (now P.T. Dein Prima Generator) in Indonesia |
| 1976-04 |
Completed Fukui factory and commenced operations |
| 1981-05 |
Established joint venture United Machinery Services Pte. Ltd. (now Denyo United Machinery Pte. Ltd.) in Singapore with local capital |
| 1982-01 |
Completed and relocated to new Saitama factory |
| 1983-02 |
Listed on the Second Section of the Tokyo Stock Exchange |
| 1984-05 |
Entered the water-related equipment field, developing and starting production of engine high-pressure water pumps and drainage pipe cleaning devices |
| 1988-04 |
Developed and started sales of cogeneration systems and uninterruptible power supplies. Acquired shares of D.B.S. Co., Ltd. (now Denyo Kosan Co., Ltd.) |
| 1988-04 |
Entered the new business sector, developed and started selling cogeneration systems and uninterruptible power supplies. Acquired shares of D-B-S Corporation (now Denyo Kousan Corporation) |
| 1991-10 |
Entered the aerial work platform field and started sales |
| 1992-12 |
Established a subsidiary in the United States, Denyo America Corporation |
| 1995-06 |
Announced the groundbreaking new gasoline engine welder GAW series adopting permanent magnets |
| 1995-08 |
Established a joint venture in the United States, Denyo Manufacturing Corporation |
| 1997-10 |
Launched a new series of engine compressors, the 'DIS series' |
| 1997-12 |
Obtained ISO 9001 certification at Fukui Factory |
| 2000-03 |
Listed on the First Section of the Tokyo Stock Exchange |
| 2000-06 |
Established a subsidiary in Singapore, Denyo Asia Pte. Ltd. |
| 2003-05 |
Closed the Shiga factory and consolidated production at Fukui Factory. The Shiga factory will serve as a logistics center and a sub-factory for Fukui |
| 2006-10 |
Obtained ISO 14001 certification at Fukui Factory |
| 2006-12 |
Relocated headquarters to Nihonbashi Horidomecho, Chuo Ward |
| 2007-06 |
Acquired shares and made Nishihatsu Corporation (now Nishihatsu Co., Ltd.) a subsidiary |
| 2007-10 |
Established Denyo Europe B.V. in the Netherlands |
| 2009-07 |
Merged Denyo Techno Service and Denyo Trading |
| 2010-05 |
Established a subsidiary in Vietnam, Denyo Vietnam Co., Ltd. |
| 2013-03 |
Built a new development and training center in Sakado City, Saitama Prefecture |
| 2015-02 |
Denyo Vietnam Co., Ltd. expanded its second factory and began production of engine generators |
| 2020-02 |
Established a subsidiary in Vietnam, Denyo Trading Vietnam Co., Ltd. |
| 2022-04 |
Transitioned to the Prime Market of the Tokyo Stock Exchange |
| 2023-03 |
Established a Service Center Kanto in Sakura City, Chiba Prefecture |
| 2025-01 |
Completed and commenced operations at Nishihatsu Corporation's new headquarters factory |
| 2025-04 |
A new Service Center West Japan was established in Okayama City, Okayama Prefecture |
