| Dec. 1985 | Nihon KOHA Co., Ltd. established in Nerima-ku, Sekimachi Kita, Tokyo, with the objective of employing new technologies based on optoelectronics to develop, design, and sell unique products. The manufacturing, inspection and shipping was consigned to “Mizuho Denso Co., Ltd.” |
| Oct. 1986 | Began sale of vending machine keyboards. |
| Aug. 1987 | Began sale of interlocking pushbuttons for vending machines. |
| Sep. 1988 | Established “Op-Seed Tsunan Co., Ltd.” In Nakauonuma-gun, Tsunan-cho, Niigata Prefecture to manufacture and sell interlocking pushbuttons for vending machines and other products. |
| Oct. 1989 | Merged with Mizuho Denso Co, Ltd., thereby, combining all manufacturing and sales operations. |
| Nov. 1989 | Changed company name to “KOHA Co, Ltd.” |
| Aug. 1990 | Moved head office to Nerima-ku, Higashi Oizumi, Tokyo. |
| Jan. 1991 | Constructed the “Hamamatsu factory” in Hosoe-cho, Inasa-gun, Shizuoka Prefecture. |
| Oct. 1992 | Proposed and created a single-unit price display unit for vending machines. |
| Jun. 1993 | Began manufacture and sale of LED backlights for LCD displays. |
| Oct. 1994 | Developed a dot matrix unit with a unique construction, and created a built-in message board for vending machines. |
| Mar. 1995 | Introduced and installed a departure information display as a terminal for the JR East Japan “Autonomous Decentralized Transport Operation Control System.” |
| Mar. 1995 | Opened the “Nagoya Sales Office” in Atsuta-ku, Nagoya, Aichi Prefecture. |
| Mar. 1996 | Developed and installed a passenger information display for JR Ofuna Station. |
| May. 1997 | Established “Op-Seed Co., (BD) Ltd.” in the People's Republic of Bangladesh. |
| Feb. 1998 | Began manufacture and sale of Full-color dot-matrix for Picture indication machine. |
| Feb. 1998 | Opened the “Himeji Sales Office” in Himeji, Hyogo Prefecture. |
| Jul. 1998 | Listed stock in the over-the-counter market. |
| Feb. 2000 | Developed and created 3 colors (Red Blue Green) LED lump-3in1. |
| Jul. 2001 | Hamamatsu factory acquires "ISO9001" certification. |
| Apr. 2002 | Moved head office to Kouyama, Nerima-ku, Tokyo. |
| Mar. 2004 | KOHA Co, Ltd acquires "ISO14001" certification. |
| Nov. 2005 | Opened the "Logistics Center" in Tsurugashima, Saitama Prefecture. |
| Apr. 2006 | Began manufacture and sale of backlight for sign & display "Shining Eye". |
| May. 2008 | Tamura Corporation acquires 52.1% stake in the Company Tender Offer Bid, making the Company a consolidated subsidiary of Tamura Corporation. |
| Aug. 2008 | Began manufacture and sale of LED Bulb "Shining Eye". |
| Apr. 2009 | Moved Nagoya Sales Office to Meito-ku, Nagoya, Aichi Prefecture. |
| Aug. 2010 | Aug. 2010 |
| Sep. 2010 | Board lights won the Good Design Award. |
| Aug. 2011 | Became a wholly owned subsidiary of Tamura Corporation by exchange of shares. |
| Aug. 2011 | Head office acquires "ISO9001" certification. |
| Sep. 2014 | Moved head office to Nerima-ku, Higashi Oizumi, Tokyo. |
