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.