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1930's
| April 1930 - | Sankosha was established at 22 Shin-Saiwai-cho in Tokyo |
| April 1932 - | Moved to present location at 4-3-8 Osaki, Shinagawa-ku, Tokyo |
| September 1932 - | Koshinsha subsidiary was established at Meguro-ku, Tokyo |
| June 1939 - | The company was incorporated |
1940's
| May 1940 - | Koshinsha factory moved to Kitamagome in Ota-ku and test equipment manufacture began |
| November 1946 - | Became NTT Authorized Cable Terminal Box manufacturer |
| November 1947 - | Became Japan National Railways Authorized “R” Type Protector manufacturer |
| April 1948 - | Developed the world’s first self restorable overvoltage gas tube arrester with a bimetal strip |
| June 1948 - | Improved S Type Arrester and became approved supplier to the electric power companies |
1950's
| April 1952 - | Koshinsha was incorporated |
| September 1952 - | Established Telecommunications Equipment Division. Began manufacture of Power Monitoring Systems, Paging Systems, Cordless Telephone and sales to Power Companies, Police Department, etc |
| May 1955 - | Koshinsha developed automatic electric rice cooker which was then sold beginning in October under the Toshiba Corporation brand name |
| October 1958 - | Created and Chaired Japan Telephone and Telegram Public Corporation terminal box suppliers committee |
| April 1959 - | Sanko Tsushinki Company subsidiary was established |
1960's
| November 1960 - | Began production at new Sagami Factory |
| September 1961 - | Created and chaired Telecommunications Equipment Committee Cable Materials Sub-committee |
| September 1963 - | Became Japan National Railways Official Supplier of various protective devices for the Tokaido Shinkansen (Bullet Train). Developed cable protectors |
| November 1969 - | Koshinsha opened Omiya Factory. Began manufacture of household electric appliances |
1970's
| November 1972 - | Received Hatsumei Kyokai (Invention Institute) “Invention Promotion Award” for the development of gas filled discharge tube manufacturing techniques |
| October 1975 - | Koshinsha’s Omiya Factory became a JIS (Japan Industrial Standards) approved electric oven manufacturer |
| November 1975 - | World Products Inc. became an Authorized US Distributor of Sankosha gas tube arresters |
| November 1976 - | Received “Ohm Technical Prize” for static induction powered Airway Obstruction Light |
| November 1978 - | Sankosha Engineering (S) Pte., Ltd. was established in Singapore |
| October 1979 - | Received Hatsumei Kyokai (Invention Institute) “Invention Promotion Award” for the development of Multi-Element Discharge Tube and required manufacturing equipment |
1980's
| January 1980 - | Received Rural Electrification Administration (REA) Approval for ceramic gas tube arresters |
| November 1984 - | Became Northern Telecom’s Authorized Distributor in Japan |
| October 1985 - | Koshinsha Co. and Sankosha Tsushinki Co. were consolidated and the company was renamed Sankosha Corporation |
| April 1986 - | Paid-In capital was increased to ¥975,000,000 |
| January 1987 - | Sankosha U.S.A., Inc. was established in Los Angeles, California |
| April 1987 - | Developed, manufactured and began selling fiber optic distribution boxes |
| August 1988 - | Krone became an Authorized Distributor of Sankosha gas tube arresters |
| August 1988 - | First issue Sankosha commercial bonds totaling ¥100,000,000 |
| September 1988 - | Second issue Sankosha commercial bonds totaling ¥100,000,000 |
| April 1989 - | Received Science and Technology Agency Award for research in signal systems using existing power distribution networks |
| November 1989 - | Received Shibusawa Award for 500,000V transmission line current checker development |
1990's
| March 1990 - | Third issue Sankosha commercial bonds totaling ¥100,000,000 |
| May 1991 - | Franklin Japan Corporation, Weather Information Provider, was established |
| September 1994 - | Opto Techno Co., Ltd. was established |
| October 1994 - | Energy Saving Systems Department was established |
| February 1995 - | US Companies Lightning Location and Protection, Inc. (LLP), Atmospheric Research Systems, Inc. (ARSI) and GeoMet Data Services, Inc. (GDS) were acquired and consolidated to form Global Atmospherics, Inc |
| September 1995 - | P. T. Santelindo Kencana, a joint venture in Indonesia, was established |
| February 1998 - | Provided weather information in support of the 18th Winter Olympic Games at Nagano using Dual Polarization Doppler Weather Radar System |
| March 1998 - | Obtained ISO 9001 Certification |
2000's
| November 2000 - | Won “48th Electrical Science and Engineering Award” for Development and Operation of Driven-Arc-Type Fault Current Limiter for 6.6 kV Class distribution lines |
| August 2002 - | Sagami Factory was renamed Sagami Techno Center |
| October 2002 - | Obtained ISO 14001 Certification |
| 2003 - | Established Sankosha office in Hong Kong |
| - | Development and sale of F Series 3 GHz coaxial protectors |
| - | Development and sale of simple CCTV monitoring system using webcams |
| 2005 - | JIS Compliant Surge Protector development |
| - | Developed energy saving Airway Obstruction Light Model OM-3C |
| - | Sankosha’s home grounding kit, “Home Earth” sales began |
| 2006 - | Hosted seminar in celebration of our 75th year in business |
| - | Sankosha Guangzhou Inc. was established |
| 2007 - | Organized Japan’s first Lightning Protection System Industrial Group and was designated a Director of the group and elected to chair the technical committee |
| - | Faced with the challenge of creating a small size high current capability device, Sankosha succeeded in commercializing Japan’s first three electrode surface mount Gas Discharge Tube (3SD4 Series) |
| - | Became the exclusive distributor in Japan for Doble Engineering of Boston, MA USA who makes electric power company asset (transformers, relays, switchgear, etc.) condition assessment products |
| - | Introduced PoE capable Local Area Network (LAN) protector (NET Barrier PoE) |
| 2008 - | Won the Japan Electric Association’s Shibusawa Award for achievements in the area of lightning protection for electric and electronic equipment |
| - | Given the Ministry of the Economy’s Trade and Industry Award of Merit I in the field of Electric Safety |
| - | Developed a coaxial surge protector with high current (20kA) handling capability |
| - | Established Nanjing Jyunkoh Technology Inc., a joint venture company in China |
| 2009 - | Sankosha Corporation and Taiseikensetsu Company received the 21st Technology Sector Society Award for the development of the electromagnetic field analysis simulation system to estimate current flow in buildings |
| - | Received the Second Electrical Technical Award for the electrical rice cooker as a “cornerstone development” from the Institute of Electrical Engineers |
2010's
| 2010 - | Won the “Certificate of Appreciation for Achievement in Trade” from the United States Department of Commerce for sales of US Made products in Japan |
| - | Opened Sankosha’s Online Shop |
| - | Celebrated our 80th year in business |
| - | Received the Certificate of Appreciation for Achievement in Trade from the US Department of Commerce as a contributor to the sales of US products in Japan |
| 2011 - | Our Representative Office in Beijing, China was established |
| - | Received the “Third Engineering Encouragement Award” for joint research in Total Lightning Protection Technology from the engineering association of Japan |
| - | “Surge Print” received the 2011 “Good Design Award” |
| 2012 - | Developed a “Smart SPD” equipped with the capability to monitor deterioration in protection and notify the user when replacement is recommended |
| - | Sankosha employee received the Chairperson’s Award from the IEC Activity Promotion Council |
| - | Received a letter of thanks from the Hokuriku Electric Power Company for our work on the upgrade of their central commissioning office system |
| - | Developed “Smart SPD” system with the capability to count and record the number of protection operations |
| - | The Smart SPD Model SMB-MZSR200JK1 won the 2012 “Good Design Award” |
| - | Received the “Electrotechnical Science and Technology Award” from the Japan Science and Technology Education Foundation for the development of a system able to detect and locate winter lightning |
| 2013 - | Airway Obstruction Light Model OM-6C equipped with medium light intensity LED’s was approved by the Aviation Bureau |
| - | Smart SPD equipped with “time to replace” indicator was registered with the New Technical Information System of the Ministry of Land, Infrastructure and Transport |
| - | Sankosha Korea Corporation was established in Seoul |
| - | Sankosha Vietnam was established in Hanoi |
| 2014 - | Introduced 10G Base-T (Cat 6) Local Area Network (LAN) Protector using isolating transformer technology |
| - | Sankosha employee awarded the 7th Hoshino Prize |
| - | Sankosha employees receive the IEC 1906 Award |
| - | SAN-EARTH approved for use grounding broadband cabinets at British Telecom |
| 2015 - | Sankosha employee received IEC 1906 Award recognizing exceptional achievement |
| 2016 - | Surge Protector Model GPSP1-L1 was developed to protect GPS equipment from surges entering through the antenna port |
| - | Sankosha Engineering Thailand Co., LTD. was established in Bangkok | 2019 - | BetaTech and its subsidiary Ace Lion (-Lightning protection system company) were acquired and made wholly owned subsidiaries |
2020's
| April 2020 - | 90th Anniversary |