| 1936 |
NGK Spark Plug Co., Ltd. was established in 1936 (Showa 11). |
| 1936 |
Founded Nippon Tokei Kogyo Co., Ltd., with capital of 1 million yen. |
| 1936 |
Founded Nippon Tokki Corporation in 1936 (Showa 11) |
| 1937 |
In 1937 (Showa 12), manufacturing of NGK spark plugs began. |
| 1937 |
Started manufacturing NGK spark plugs. |
| 1937 |
In 1937 (Showa 12), Nippon Tokki began manufacturing NGK spark plugs |
| 1949 |
In 1949 (Showa 24), manufacturing of NTK new ceramics began. |
| 1949 |
Started manufacturing NTK New Ceramics. |
| 1949 |
Listed on Tokyo and Nagoya Stock Exchanges. |
| 1949 |
Started manufacturing NTK new ceramics: Listed on Tokyo and Nagoya Stock Exchanges |
| 1958 |
In 1958 (Showa 33), manufacturing of ceramic bytes and chips began. |
| 1958 |
Started manufacturing ceramic bytes and tips. |
| 1958 |
Launched copper-axle wide-range plugs, pioneering the automotive industry. |
| 1958 |
Started manufacturing ceramic bytes and tips: Launched copper-axle wide-range plugs, pioneering the automotive industry |
| 1959 |
In 1959 (Showa 34), Brazil Special Ceramics Co., Ltd. was established. |
| 1959 |
Established Brazil Special Ceramics Co., Ltd. (now Brazil Special Ceramics Co., Ltd.) |
| 1961 |
In 1961 (Showa 36), established Nittoku Manufacturing Co., Ltd. |
| 1961 |
In 1961 (Showa 36), Nittoku Seisakusho Co., Ltd. was established. |
| 1961 |
Established Nikotech Seisakusho Co., Ltd. |
| 1962 |
In 1962 (Showa 37), operations commenced at Komaki Factory, Aichi Prefecture. |
| 1962 |
Started operation at Komaki Factory (Aichi Prefecture). |
| 1966 |
In 1966 (Showa 41), established NGK Spark Plug Inc. in the United States (sales company). |
| 1966 |
Establishment of NGK Spark Plugs Inc. in the United States (Sales Company) |
| 1967 |
In 1967 (Showa 42), began manufacturing ceramic IC packages. |
| 1967 |
Start of ceramic IC package manufacturing |
| 1973 |
In 1973 (Showa 48), established NGK Spark Plug (Malaysia) Sdn. Bhd. |
| 1973 |
Establishment of NGK Spark Plugs Malaysia Sdn. Bhd. |
| 1973 |
Start of automotive temperature sensor manufacturing |
| 1973 |
Established NGK Spark Plugs Malaysia Sdn. Bhd.: Began manufacturing automotive temperature sensors |
| 1974 |
In 1974 (Showa 49), established Hiyori Machinery Co., Ltd. and Siam NGK Spark Plug Co., Ltd. |
| 1974 |
Establishment of Hiyori Machinery Co., Ltd. |
| 1974 |
Operation start of Miyakonojo Factory (Kagoshima Prefecture) |
| 1974 |
Establishment of Siam NGK Spark Plugs Co., Ltd. |
| 1974 |
Establishment of Nittoku Transportation Co., Ltd. |
| 1974 |
Established Hiyori Machinery Co., Ltd.: Started operation of Miyanojo Factory (Kagoshima Prefecture): Established Siam NGK Spark Plugs Co., Ltd.: Established Nittoku Transportation Co., Ltd. |
| 1975 |
In 1975 (Showa 50), established NGK Spark Plug (UK) Ltd. |
| 1975 |
Establishment of NGK Spark Plugs UK Ltd. |
| 1976 |
In 1976 (Showa 51), established NGK Spark Plug Manufacturing Inc. in the United States. |
| 1976 |
Establishment of NGK Spark Plugs Manufacturing Inc. in the United States (Manufacturing Company) |
| 1977 |
In 1977 (Showa 52), established NGK Spark Plug (Indonesia) Ltd. |
| 1977 |
Establishment of NGK Spark Plugs Indonesia Co., Ltd. |
| 1978 |
In 1978 (Showa 53), established U.S. Special Ceramics Inc. (ceramic manufacturing company). |
| 1978 |
Establishment of NGK Special Ceramics Inc. (Ceramic Manufacturing Company) in the United States |
| 1979 |
In 1979 (Showa 54), established NGK Spark Plug (Ecuador) Ltd. and NGK Spark Plug (Germany) Ltd. |
| 1979 |
Establishment of NGK Spark Plugs Ecuador Ltd. |
| 1979 |
Establishment of NGK Spark Plugs Germany Ltd. (Currently European NGK Spark Plugs Ltd.) |
| 1979 |
Established Ecuador NGK Spark Plugs Co., Ltd.: Established German NGK Spark Plugs Co., Ltd. (now European NGK Spark Plugs Co., Ltd.) |
| 1980 |
In 1980 (Showa 55), established NGK Spark Plug (Australia) Ltd. |
| 1980 |
In 1980 (Showa 55), Australia NGK Spark Plugs Co., Ltd. was established, and began manufacturing Quick Glow System (QGS). |
| 1980 |
Establishment of NGK Spark Plugs Australia Ltd. |
| 1980 |
Start of Quick Glow System (QGS) manufacturing |
| 1980 |
Established Australian NGK Spark Plugs Co., Ltd.: Began manufacturing Quick Glow System (QGS) |
| 1982 |
In 1982 (Showa 57), established NGK Spark Plug (Canada) Ltd. and began manufacturing automotive oxygen sensors. |
| 1982 |
In 1982 (Showa 57), Canada NGK Spark Plugs Co., Ltd. was established, began manufacturing automotive oxygen sensors, and Tono Ceramics Co., Ltd. and Kamioka Ceramics Co., Ltd. were also established. |
| 1982 |
Establishment of NGK Spark Plugs Canada Ltd. |
| 1982 |
Start of automotive oxygen sensor manufacturing |
| 1982 |
Establishment of Tono Ceramics Co., Ltd. |
| 1982 |
Establishment of Kamioka Ceramics Co., Ltd. |
| 1982 |
Established Canadian NGK Spark Plugs Co., Ltd.: Began manufacturing automotive oxygen sensors: Established Tono Ceramics Co., Ltd.: Established Kamioka Ceramics Co., Ltd.: Established Canadian NGK Spark Plugs Co., Ltd. and started manufacturing automotive oxygen sensors |
| 1984 |
In 1984 (Showa 59), merged three companies including U.S. Special Ceramics Inc. and NGK Spark Plug Inc. |
| 1984 |
In 1984 (Showa 59), merged US Special Ceramics Co., Ltd., US NGK Spark Plugs Co., Ltd., and US Special Ceramics Co., Ltd. & US NGK Spark Plugs Manufacturing Co., Ltd., with US-based companies, and established Taiwan NGK Spark Plugs Co., Ltd. and Iijima Ceramics Co., Ltd. |
| 1984 |
In 1984 (Showa 59), US Special Ceramics Co., Ltd. was the surviving company, and merged with US Special Ceramics Co., Ltd., US NGK Spark Plug Co., Ltd., and US NGK Spark Plug Manufacturing Co., Ltd. Additionally, Kani Ceramics Co., Ltd., Taiwan NGK Spark Plug Co., Ltd., and Iijima Ceramics Co., Ltd. were established. |
| 1984 |
Succeeded United States Special Ceramics Co., Ltd., and merged the three companies: United States Special Ceramics Co., Ltd., United States NGK Spark Plugs Co., Ltd., and United States NGK Spark Plug Manufacturing Co., Ltd. |
| 1984 |
Establishment of Kan-i Ceramic Co., Ltd. |
| 1984 |
Establishment of Taiwan NGK Spark Plugs Co., Ltd. |
| 1984 |
Establishment of Iijima Ceramic Co., Ltd. |
| 1984 |
Merged U.S. Special Ceramics Inc., U.S. NGK Spark Plugs Inc., and U.S. NGK Spark Plugs Manufacturing Inc. with the surviving company: Established Kani Ceramics Co., Ltd.: Established Taiwan NGK Spark Plugs Co., Ltd.: Established Iijima Ceramics Co., Ltd. |
| 1985 |
Launched ceramic glow plugs in 1985 (Showa 60). |
| 1985 |
Launch of Ceramic Glow Plugs |
| 1989 |
Established Ceramic Sensor Co., Ltd. and Tomoe Industry Co., Ltd. in South Korea in 1989 (Heisei 1). |
| 1989 |
In 1989 (Heisei 1), Tomoshin Industries Co., Ltd. (Korea) participated capital and Ceramic Sensor Co., Ltd. was established. |
| 1989 |
In 1989 (Heisei 1), Tomoshin Industries Co., Ltd. (Korea) participated capital and Ceramic Sensor Co., Ltd. was established. |
| 1989 |
友進工業（株）（韓国）資本参加 |
| 1989 |
Establishment of Ceramic Sensors Co., Ltd. |
| 1989 |
Kwonjin Industrial Co., Ltd. (Korea) participated with capital: Established Ceramics Sensors Co., Ltd. |
| 1990 |
Started manufacturing bioceramics in 1990 (Heisei 2), and established the European Technical Center with European Special Ceramics Co., Ltd. |
| 1990 |
In 1990 (Heisei 2), manufacturing of bio-ceramics began, and European Special Ceramics Co., Ltd. and European Technical Center were established. |
| 1990 |
In 1990 (Heisei 2), manufacturing of bio-ceramics began, and European Special Ceramics Co., Ltd. and European Technical Center were established. |
| 1990 |
Start of Bio-Ceramics Production |
| 1990 |
Establishment of Europe Special Ceramics Co., Ltd. |
| 1990 |
Completion of European Technical Center |
| 1990 |
Started manufacturing bioceramics: Established Europe Special Ceramics Co., Ltd.: Completed European Technical Center: Began manufacturing bioceramics: Established Europe Special Ceramics Co., Ltd.: Completed European Technical Center |
| 1991 |
In 1991 (Heisei 3), the production of spark plugs exceeded 5 billion units. |
| 1991 |
Cumulative Spark Plug Production Surpasses 5 Billion Units |
| 1992 |
Established Nikkei Alpha Service Co., Ltd. and Mexico NGK Spark Plug Co., Ltd. in 1992 (Heisei 4). |
| 1992 |
Establishment of Nittoku Alpha Service Co., Ltd. |
| 1992 |
Establishment of Mexico NGK Spark Plugs Co., Ltd. |
| 1992 |
Established Nittoku Alpha Service Co., Ltd.: Established Mexico NGK Spark Plugs Co., Ltd. |
| 1993 |
Founded Brazil Technical Center, France NGK Spark Plug Co., Ltd., Nakatsugawa Ceramic Co., Ltd., and Korea NTK Tools Co., Ltd. in 1993 (Heisei 5). |
| 1993 |
In 1993 (Heisei 5), Brazil Technical Center, France NGK Spark Plug Co., Ltd., Nakatsugawa Ceramics Co., Ltd., and Korea NTK Tool Co., Ltd. were established. |
| 1993 |
Completion of Brazil Technical Center |
| 1993 |
Establishment of France NGK Spark Plugs Co., Ltd. |
| 1993 |
Establishment of Nakatsugawa Ceramic Co., Ltd. |
| 1993 |
Establishment of Korea NTK Tools Co., Ltd. (currently Korea NTK Ceramic Co., Ltd.) |
| 1993 |
Completed Brazil Technical Center: Established France NGK Spark Plugs Co., Ltd.: Established Nakatsugawa Ceramics Co., Ltd.: Established Korean NTK Tools Co., Ltd. (now Korean NTK Ceramics Co., Ltd.) |
| 1994 |
Started operations at Ise Factory (Mie Prefecture) and established US Sensor Co., Ltd. and Taiwan NTK Ceramic Co., Ltd. in 1994 (Heisei 6). |
| 1994 |
In 1994 (Heisei 6), Ise Factory (Mie Prefecture) started operation, and US Sensor Co., Ltd. and Taiwan NTK Ceramic Co., Ltd. were established. |
| 1994 |
In 1994 (Heisei 6), Ise Factory (Mie Prefecture) started operation, and US Sensor Co., Ltd. and Taiwan NTK Ceramic Co., Ltd. were established. |
| 1994 |
Start of Operations at Ise Factory (Mie Prefecture) |
| 1994 |
Establishment of U.S. Sensor Co., Ltd. |
| 1994 |
Establishment of Taiwan NTK Ceramic Co., Ltd. |
| 1994 |
Started operation of Ise Factory (Mie Prefecture): Established U.S. Sensor Co., Ltd.: Established Taiwan NTK Ceramics Co., Ltd. |
| 1995 |
Established US Holding Co., Ltd. in 1995 (Heisei 7). |
| 1995 |
Establishment of U.S. Holding Co., Ltd. |
| 1996 |
Completed the US Technical Center in 1996 (Heisei 8). |
| 1996 |
Completion of the US Technical Center |
| 1997 |
Launched NGK Iridium Plugs and completed Komaki Technical Center in 1997 (Heisei 9). |
| 1997 |
Launch of NGK Iridium Plugs |
| 1997 |
Completion of Komaki Technical Center |
| 1997 |
Start of mass production of Organic IC Packages |
| 1997 |
Launched NGK Iridium Plugs: Completed Komaki Technical Center: Began mass production of Organic IC Packages: Launched NGK Iridium Plugs: Completed Komaki Technical Center: Began mass production of Organic IC Packages |
| 2000 |
Launched NGK Iridium IX Plugs in 2000 (Heisei 12). |
| 2000 |
Launch of NGK Iridium IX Plugs |
| 2001 |
Established Singapore NGK Spark Plug Co., Ltd. and began mass production of medical oxygen concentrators in 2001 (Heisei 13). |
| 2001 |
In 2001 (Heisei 13), Singapore NGK Spark Plug Co., Ltd. was established, mass production of medical oxygen concentrators began, Komaki Research Building was completed, and Nansei Ceramic Co., Ltd. was established. |
| 2001 |
In 2001 (Heisei 13), Singapore NGK Spark Plug Co., Ltd. was established, mass production of medical oxygen concentrators began, and Komaki Research Building and Nansei Ceramic Co., Ltd. were established. |
| 2001 |
Establishment of Singapore NGK Spark Plug Co., Ltd. |
| 2001 |
Start of mass production of medical oxygen concentrators |
| 2001 |
Completion of Komaki Research Building |
| 2001 |
Establishment of Nansei Ceramics Co., Ltd. |
| 2001 |
Established Singapore NGK Spark Plugs Co., Ltd.: Began mass production of medical oxygen concentrators: Completed Komaki Research Building: Established Nansei Ceramics Co., Ltd. |
| 2002 |
Reorganized US Specialty Ceramics Co., Ltd. and US Sensor Co., Ltd. by product market in 2002 (Heisei 14), and established Middle East NGK Spark Plug Co., Ltd. |
| 2002 |
In 2002 (Heisei 14), US Special Ceramics Co., Ltd. and US Sensor Co., Ltd. were reorganized by product market, and Middle East NGK Spark Plug Co., Ltd. was established. |
| 2002 |
In 2002 (Heisei 14), US Special Ceramics Co., Ltd. and US Sensor Co., Ltd. were reorganized by product market, and Middle East NGK Spark Plug Co., Ltd. was established. |
| 2002 |
Reorganization of US Special Ceramics Co., Ltd. and US Sensor Co., Ltd. into US Special Ceramics Co., Ltd. and US Technology Co., Ltd. by product market |
| 2002 |
Establishment of Middle East NGK Spark Plug Co., Ltd. |
| 2002 |
Reorganized U.S. Special Ceramics Inc. and U.S. Sensor Co., Ltd. into U.S. Special Ceramics Inc. and U.S. Technology Inc. by product market: Established Middle East NGK Spark Plugs Co., Ltd. |
| 2003 |
Founded Shanghai Special Ceramics Co., Ltd. and Poland NTK Co., Ltd. in 2003 (Heisei 15). |
| 2003 |
In 2003 (Heisei 15), Shanghai Special Ceramics Co., Ltd. and Poland NTK Co., Ltd. were established. |
| 2003 |
Establishment of Shanghai Special Ceramics Co., Ltd. |
| 2003 |
Establishment of Poland NTK Co., Ltd. |
| 2003 |
Established Shanghai Special Ceramics Co., Ltd.: Established Polish NTK Co., Ltd. |
| 2004 |
Started mass production of rapid heating type ceramic glow plugs in 2004 (Heisei 16). |
| 2004 |
In 2004 (Heisei 16), mass production of rapid heating type ceramic glow plugs began. |
| 2004 |
Start of mass production of rapid heating ceramic glow plugs |
| 2005 |
Established Thailand NGK Spark Plug Co., Ltd. and began sales of bioactive bone paste in 2005 (Heisei 17). |
| 2005 |
In 2005 (Heisei 17), Thai NGK Spark Plug Co., Ltd. was established, and sales of bioactive bone paste began. |
| 2005 |
In 2005 (Heisei 17), established NGK Spark Plugs (Thailand) Co., Ltd. and began sales of bioactive bone paste. |
| 2005 |
Establishment of Thailand NGK Spark Plug Co., Ltd. |
| 2005 |
Start of sales of bioactive bone paste |
| 2005 |
Established Thai NGK Spark Plugs Co., Ltd.: Started sales of bioactive bone paste |
| 2006 |
Founded India Special Ceramics Co., Ltd. and achieved domestic production of 10 billion plugs in 2006 (Heisei 18). |
| 2006 |
In 2006 (Heisei 18), Indian Special Ceramics Co., Ltd. was established, and domestic production of plugs reached 10 billion units. |
| 2006 |
In 2006 (Heisei 18), established Indian Special Ceramics Co., Ltd., reaching 10 billion plugs produced domestically. |
| 2006 |
Establishment of India Special Ceramics Co., Ltd. |
| 2006 |
Achievement of 10 billion spark plug units produced domestically |
| 2006 |
Indo Special Ceramics Co., Ltd. established: Achieved 10 billion plugs produced domestically |
| 2007 |
Established South Africa NGK Spark Plug Co., Ltd. in 2007 (Heisei 19). |
| 2007 |
Establishment of South Africa NGK Spark Plug Co., Ltd. |
| 2008 |
Founded Philippines NGK Spark Plug Co., Ltd. in 2008 (Heisei 20). |
| 2008 |
Establishment of Philippines NGK Spark Plug Co., Ltd. |
| 2009 |
In 2009 (Heisei 21), merged other ceramic-related companies into Nakatsugawa Ceramic Co., Ltd., which remains the surviving company, and renamed it NTK Ceramic Co., Ltd. |
| 2009 |
In 2009 (Heisei 21), merged Nagoya Ceramic Co., Ltd., Kani Ceramic Co., Ltd., and Iijima Ceramic Co., Ltd. with Nagoya Ceramic Co., Ltd. as the surviving company, and renamed it NTK Ceramic Co., Ltd. |
| 2009 |
(The company) Nagatsugawa Ceramics remains the surviving company, and it merged with Nagatsugawa Ceramics Co., Ltd., Kani Ceramics Co., Ltd., and Iijima Ceramics Co., Ltd., three companies. |
| 2009 |
The company name Nagatsugawa Ceramics Co., Ltd. was changed to NTK Ceramics Co., Ltd. |
| 2009 |
Merged with Nakatsugawa Ceramics Co., Ltd. as the surviving company, and three companies: Nakatsugawa Ceramics Co., Ltd., Kani Ceramics Co., Ltd., and Iijima Ceramics Co., Ltd.: Changed the name of Nakatsugawa Ceramics Co., Ltd. to NTK Ceramics Co., Ltd. |
| 2011 |
Established Tokushū Tokuyō (Ltd.) in 2011 (Heisei 23). |
| 2011 |
Established Junsu Special Ceramics (Ltd.) |
| 2012 |
Established Vietnam NGK Spark Plugs (Ltd.) in 2012 (Heisei 24). |
| 2012 |
Established Vietnam NGK Spark Plug (Ltd.) |
| 2013 |
In 2013 (Heisei 25), formed a capital and business alliance with Eastern Corporation, renamed Tono Ceramics Co., Ltd. to Nittoku Spark Tech Tono Co., Ltd., and established NGK Spark Plugs Eurasia, Spark Tech Thailand Co., Ltd., and Nittoku Electronics Co., Ltd. |
| 2013 |
In 2013 (Heisei 25), capital and business alliance with Eastern Co., Ltd., the company name of Tono Ceramics was changed to Nittoku Spark Tech Tono Co., Ltd., and NKG Spark Plug Eurasia Co., Ltd., Spark Tech Thailand Co., Ltd., and Nittoku Electronics Co., Ltd. were established. |
| 2013 |
In 2013 (Heisei 25), formed capital and business alliance with Eastern Co., Ltd., renamed Tono Ceramics Co., Ltd. to Nikotech Tono Co., Ltd., and established NGK Spark Plugs Eurasia, Sparktech Thailand, and Nikotech Electronics Co., Ltd. |
| 2013 |
Entered a capital and business alliance with Eastern Corporation |
| 2013 |
The company name Tono Ceramics Co., Ltd. was changed to Nittoku Spark Tech Tono Co., Ltd. |
| 2013 |
Established NGK Spark Plug Eurasia (Ltd.) |
| 2013 |
Established Spark Tech Thailand Co., Ltd. |
| 2013 |
Established Nittoku Electronics Co., Ltd. |
| 2013 |
Capital and business alliance with Eastern Co., Ltd.: Changed the name of Tono Ceramics Co., Ltd. to Nikko Spark Tech Tono Co., Ltd.: Established NGK Spark Plug Eurasia: Established Spark Tech Thailand: Established Nikko Electronics Co., Ltd. |
| 2014 |
In 2014 (Heisei 26), commenced operations at Nittoku Spark Tech Tono's Nino Headquarters Plant. |
| 2014 |
In 2014 (Heisei 26), Niino main factory of Nikotech Tono Co., Ltd. began operations. |
| 2014 |
Operational start of Nittoku Spark Tech Tono Niwano Head Office Factory |
| 2015 |
In 2015 (Heisei 27), acquired all shares of Japan Ceratec and took over the business of Wels Manufacturing (Ltd.). |
| 2015 |
In 2015 (Heisei 27), acquired all shares of Japan Seratech Co., Ltd. and took over Wells Manufacturing Co., Ltd. |
| 2015 |
Acquired all shares of Japan Seratech |
| 2015 |
Acquired business of Wels Manufacturing (Ltd.) |
| 2015 |
Acquired all shares of Japan Seratech Co., Ltd.: Acquired business of WELLS Manufacturing Co., Ltd. |
| 2016 |
In 2016 (Heisei 28), renamed Nittoku Seisakusho Co., Ltd. to Nittoku Spark Tech WKS, renamed Japan Ceratec to NTK Ceratec, established CS Nakatsugawa Co., Ltd., formed a capital and business alliance with Japan M.D.M., and established NTK Ceramics Co., Ltd. |
| 2016 |
In 2016 (Heisei 28), Nittoku Manufacturing Co., Ltd. was renamed Nittoku Spark Tech WKS Co., Ltd., and Japan Ceratec Co., Ltd. was renamed NTK Ceratec Co., Ltd., and CS Nakatsugawa Co., Ltd. was established, with capital and business alliance with Japan M.D.M. Co., Ltd., and NTK Ceramic Co., Ltd. was established. |
| 2016 |
In 2016 (Heisei 28), renamed Nikotech Seisakusho Co., Ltd. to Nikotech Sparktech WKS, renamed Japan Seratech Co., Ltd. to NTK Seratech, established CS Nakatsugawa Co., Ltd., formed capital and business alliance with Japan M.D.M., and established NTK Ceramic Co., Ltd. |
| 2016 |
Changed company name from Nittoku Seisakusho Co., Ltd. to Nittoku Spark Tech WKS Co., Ltd. |
| 2016 |
Changed company name from Japan Seratech Co., Ltd. to NTK Seratech Co., Ltd. |
| 2016 |
Established CS Nakatsugawa Co., Ltd. |
| 2016 |
Entered a capital and business alliance with Japan M.D.M. |
| 2016 |
Established NTK Ceramics Co., Ltd. |
| 2016 |
Renamed Nikko Manufacturing to Nikko Spark Tech WKS: Renamed Japan Seratech to NTK Seratech: Established CS Nakatsugawa: Formed capital and business alliance with Japan M.D.M.: Established NTK Ceramics Co., Ltd. |
| 2017 |
In 2017 (Heisei 29), renamed Spark Tech Thailand Co., Ltd. to Asia NGK Spark Plugs Co., Ltd., and established Nittoku Smile Co., Ltd. |
| 2017 |
In 2017 (Heisei 29), Spark Tech Thailand Co., Ltd. was renamed Asia NGK Spark Plugs Co., Ltd., and Nittoku Smile Co., Ltd. was established. |
| 2017 |
Changed company name from Spark Tech Thailand Co., Ltd. to Asia NGK Spark Plug Co., Ltd. |
| 2017 |
Established Nittoku Smile Co., Ltd. |
| 2017 |
Renamed Spark Tech Thailand Co., Ltd. to Asia NGK Spark Plugs Co., Ltd.: Established Nittoku Smile Co., Ltd. |
| 2018 |
In 2018 (Heisei 30), established Sharing Factory Co., Ltd. and acquired all shares of CAIRE Inc., USA. |
| 2018 |
In 2018 (Heisei 30), established Share Factory Co., Ltd. and acquired all shares of CAIRE Inc., USA. |
| 2018 |
Established Sharing Factory Co., Ltd. |
| 2018 |
米国CAIRE社全株式取得 |
| 2018 |
Established Sharing Factory Co., Ltd.: Acquired all shares of CAIRE Inc., USA |
| 2019 |
In 2019 (Reiwa 1), established Morimura SOFC Technology Co., Ltd. |
| 2019 |
In 2019 (Reiwa 1), established Morimura SOFC Technology Co., Ltd. |
| 2019 |
Establishment of Morimura SOFC Technology Co., Ltd. |
| 2020 |
In 2020 (Reiwa 2), established CECYLLS Co., Ltd., NTK Corporation Asia Co., Ltd., NTK Medical Co., Ltd., NTK Cutting Tools Co., Ltd., and ignArt Co., Ltd. |
| 2020 |
In 2020 (Reiwa 2), established CECYLLS Co., Ltd., NTK Corporation Asia Co., Ltd., NTK Medical Co., Ltd., NTK Cutting Tools Co., Ltd., and ignArt Co., Ltd. |
| 2020 |
Establishment of CECYLLS Co., Ltd. |
| 2020 |
Establishment of NTK Corporation Asia Co., Ltd. |
| 2020 |
Establishment of NTK Medical Co., Ltd. |
| 2020 |
Establishment of NTK Cutting Tools Co., Ltd. |
| 2020 |
Establishment of ignArt Co., Ltd. |
| 2020 |
Established CECYLLS Co., Ltd.: Established NTK Corporation Asia Co., Ltd.: Established NTK Medical Co., Ltd.: Established NTK Cutting Tools Co., Ltd.: Established ignArt Co., Ltd. |
| 2021 |
In 2021 (Reiwa 3), carried out a company split due to organizational restructuring within the group, and succeeded business and merged companies. |
| 2021 |
In 2021 (Reiwa 3), conducted corporate split due to organizational reform within the group, with Nikotech Sparktech WKS as the surviving company, merged with Nikotech Sparktech Tono, and inherited plug manufacturing functions of Nippon Tokei Kogyo Co., Ltd. Additionally, continued with Ceramic Sensor Co., Ltd., merged with CS Nakatsugawa Co., Ltd., and inherited internal combustion engine sensor manufacturing functions, industrial ceramic manufacturing functions, SPE business, and respiratory system business. |
| 2021 |
Implementation of company split due to organizational reform within the group |
| 2021 |
The company will continue as Nippon Tokushu Togyo Spark Tech WKS Co., Ltd. |
| 2021 |
Merged with Tokushu Tokyo Spark Tech Tono, |
| 2021 |
And inherited the plug manufacturing functions of Nippon Tokushu Togyo Co., Ltd. |
| 2021 |
Ceramic Sensor Co., Ltd. will continue as the surviving company and merge with CS Nakatsugawa Co., Ltd. |
| 2021 |
And inherited the sensor manufacturing functions for internal combustion engines of Nippon Tokushu Togyo Co., Ltd. |
| 2021 |
NTK Cutting Tools Co., Ltd. inherits the machine tool manufacturing functions of Nippon Tokushu Togyo Co., Ltd. |
| 2021 |
Nansei Ceramic Co., Ltd. inherits the industrial ceramic manufacturing functions of Nippon Tokushu Togyo Co., Ltd. |
| 2021 |
NTK Seratech Co., Ltd. inherits the SPE business of Nippon Tokushu Togyo Co., Ltd. |
| 2021 |
NTK Medical Co., Ltd. inherits the respiratory system business of Nippon Tokushu Togyo Co., Ltd. |
| 2021 |
Implemented company split due to internal organizational reforms: Continued as the surviving company of Nikko Spark Tech WKS: Merged with Nikko Spark Tech Tono: Also inherited the plug manufacturing function of Japan Turbine Industries Co., Ltd.: Continued as the surviving company of Ceramic Sensor Co., Ltd.: Merged with CS Nakatsugawa: Also inherited the internal combustion engine sensor manufacturing function of Japan Turbine Industries Co., Ltd.: Transferred the machine tool manufacturing function of Japan Turbine Industries Co., Ltd. to NTK Cutting Tools Co., Ltd.: Transferred Japan Turbine Industries Co., Ltd.'s industrial ceramics manufacturing function to Nansei Ceramics Co., Ltd.: Transferred Japan Turbine Industries Co., Ltd.'s SPE business to NTK Ceramics Co., Ltd.: Transferred Japan Turbine Industries Co., Ltd.'s respiratory system business to NTK Medical Co., Ltd. |
| 2022 |
In 2022 (Reiwa 4), relocated headquarters to Higashi-ku, Nagoya City. |
| 2022 |
Relocated headquarters to Higashi-ku, Nagoya City |
| 2023 |
In 2023 (Reiwa 5), changed the English company name of Nippon Tokushū Ceramic Co., Ltd. from NGK SPARK PLUG CO., LTD. to Niterra Co., Ltd. |
| 2023 |
Changed the English company name of Nippon Tokushu Togyo Co., Ltd. from NGK SPARK PLUG CO., LTD. to Niterra Co., Ltd. |
| 2024 |
In 2024 (Reiwa 6), merged with US-based Technology Inc., with Niterra North America Inc. as the surviving company. |
| 2024 |
Niterra North America Co., Ltd. will continue as the surviving company and merge with US Technology Co., Ltd. |
| 2025 |
In 2025 (Reiwa 7), acquired all shares of Toshiba Materials Co., Ltd. and renamed it Niterra Materials Co., Ltd. |
| 2025 |
In 2025 (Reiwa 7), all shares of Toshiba Materials Co., Ltd. were acquired, and the company name was changed to Niterra Materials Co., Ltd. |
| 2025 |
Acquired all shares of Toshiba Materials Co., Ltd. and changed the company name to Niterra Materials Co., Ltd. |
