| 1965-02 |
昭和瀝青工業株式会社設立（兵庫県姫路市） |
| 1965-02 |
Established Showa Rekisei Industries Co., Ltd. (Himeji, Hyogo Prefecture) |
| 1966-07 |
大阪営業所開設（大阪市北区木幡町） |
| 1966-07 |
Opened Osaka sales office (Kobata-cho, Kita-ku, Osaka) |
| 1969-07 |
沖縄へのアスファルト乳剤の輸出を開始 |
| 1969-07 |
Started export of asphalt emulsion to Okinawa |
| 1970-01 |
熊本営業所及び熊本工場開設（熊本県鹿本郡植木町） |
| 1970-01 |
Opened Kumamoto sales office and plant (Ueki, Kamoto, Kumamoto) |
| 1971-09 |
和歌山営業所開設（和歌山市中之島） |
| 1971-09 |
Opened Wakayama sales office (Nakanoshima, Wakayama) |
| 1972-03 |
姫路営業所・姫路工場新設（兵庫県揖保郡太子町。妻鹿工場を移転。） |
| 1972-03 |
Relocated Mega Plant and Himeji sales office and plant newly opened (Taishi, Ibo, Hyogo.) |
| 1973-03 |
建設業法による建設大臣許可取得（特-47）第899号 |
| 1973-03 |
Acquisition of Minister of Construction Permit under the Construction Business Act (Special-47) No. 899 |
| 1974-10 |
熊本アスファルト合材プラント開設（鹿本郡植木町） |
| 1974-10 |
Opened Kumamoto Asphalt mixing plant opened (Ueki, Kamoto, Kumamoto) |
| 1975-10 |
離島向けアスファルト供給コンテナシステム開発 |
| 1975-10 |
Developed bitumen supply container system for remote islands |
| 1979-04 |
高野龍神スカイライン（和歌山県；全長42.7Km）向け : 加熱アスファルト合材プラント２基設置供給 |
| 1979-04 |
Set up two asphalt mixing plant for Koya-Ryujin Skyline (Wakayama Prefecture; total length 42.7 Km) to supply hot mix asphalt. |
| 1980-08 |
姫路アスファルト合材プラント開設（兵庫県揖保郡太子町） |
| 1980-08 |
Opened Himeji asphalt mixing plant (Taishi, Ibo, Hyogo ) |
| 1982-12 |
沖縄本島でコンテナ供給システムを用いたアスファルト販売開始 |
| 1982-12 |
Started asphalt sales with our container supply system on Okinawa Island |
| 1984-08 |
沖縄油槽所1,000tアスファルト備蓄タンク設置（沖縄市知花） : 自社油槽所網整備開始 |
| 1984-08 |
Installed a 1,000t asphalt storage tank at Okinawa oil terminal (Chibana, Okinawa), and started the development of its own asphalt storage network |
| 1985-01 |
奄美営業所及び奄美油槽所開設（鹿児島県大島郡笠利町） |
| 1985-01 |
Opened Amami sales office and oil terminal (Kasari, Oshima, Kagoshima) |
| 1987-07 |
ゲストハウス（青雲山荘）開設（兵庫県赤穂郡上郡町） |
| 1987-07 |
Opened Guesthouse (Seiun Sanso) (Kamigoori, Ako, Hyogo) |
| 1987-12 |
Opened Kyushu base Ariake oil terminal (Nagasu, Tamana-gun, Kumamoto Prefecture) |
| 1988-10 |
アスファルト自社専用内航タンカー契約運航開始 |
| 1988-10 |
Started contract operation of our own in-house asphalt tanker |
| 1988-12 |
Opened Kansai base Himeji oil terminal (Aboshi, Himeji) |
| 1991-03 |
事業目的に「産業廃棄物の処理並びに再生」を追加 |
| 1991-03 |
Added "Industrial waste disposal and reclamation" to business purpose |
| 1991-03 |
Opened Himeji recycling center (Taishi, Ibo, Hyogo) |
| 1991-03 |
Opened Nagano sales office (Aokijima, Nagano) |
| 1991-08 |
Opened Niigata sales office and Hokuriku base Joetsu oil terminal (Joetsu, Niigata) |
| 1993-09 |
本社新社屋完成（姫路市北条口４丁目２６番地） |
| 1993-09 |
Completed Head office building (4-26 Hojoguchi, Himeji) |
| 1994-03 |
㈱関組（和歌山市）とのＳ＆Ｓアスファルト合材JVプラント開設（和歌山市） |
| 1994-03 |
Established S & S asphalt mixing JV plant with Sekigumi (Wakayama) |
| 1995-09 |
沖縄中城改質アスファルト工場開設（沖縄市海邦町） |
| 1995-09 |
Opened Okinawa Nakagusuku modified asphalt plant (Nakagusuku, Okinawa) |
| 1995-11 |
Opened Himeji modified asphalt plant (Aboshi, Himeji) |
| 1995-12 |
Opened Kumamoto recycling center (Ueki, Kamoto, Kumamoto) |
| 1997-07 |
北陸基地上越石油基地開設（新潟県上越市） |
| 1997-07 |
Opened Hokuriku base Joetsu oil terminal (Joetsu, Niigata) |
| 1998-04 |
日本初の舗装用石油アスファルト（現、SK ENERGY㈱）の : 海外建設資材品質審査証明書を取得 |
| 1998-04 |
Acquired the Japan's first Certification of Quality Examination of Overseas Construction Material by JTCCM for bitumen for paving about bitumen of SK ENERGY Ltd. |
| 1998-07 |
Started operation of our own asphalt tanker TKC101 |
| 2000-06 |
姫路大型リサイクルセンター開設（兵庫県揖保郡太子町） |
| 2000-06 |
Himeji large recycling center opened (Taishi, Ibo, Hyogo) |
| 2000-08 |
Opened Hokuriku base Joetsu methanol depot (Joetsu, Niigata) |
| 2001-04 |
昭和瀝青工業（上海）有限公司開設（中国上海市） |
| 2001-04 |
Established Showa Rekisei Industries (Shanghai) Co., Ltd. in China |
| 2001-10 |
Acquisition of ISO 9001 management system certification |
| 2001-10 |
Started operation of newly built asphalt tanker "SHOREKI" (our own ocean-going vessel) |
| 2001-10 |
Opened Yatsushiro asphalt terminal (Yatsushiro, Kumamoto) |
| 2005-11 |
泉北油槽所開設（大阪府泉大津市） |
| 2005-11 |
Opened Senboku asphalt terminal (Izumiotsu, Osaka) |
| 2009-01 |
泉北改質アスファルト工場開設（大阪府泉大津市） |
| 2009-01 |
Opened Senboku modified asphalt plant (Izumiotsu, Osaka) |
| 2010-02 |
石垣油槽所開設（沖縄県石垣市） |
| 2010-02 |
Opened Ishigaki asphalt terminal (Ishigaki, Okinawa ) |
| 2012-04 |
一般社団法人日本道路建設業協会加入 |
| 2012-04 |
Joined the Japan Road Contractors Association |
| 2012-07 |
Integration of Kanto Koshinetsu sales office with Joetsu oil terminal (Joetsu, Niigata) |
| 2012-07 |
Started operation of newly built asphalt tanker "BLUE KINGDOM" (our own ocean-going vessel) |
| 2012-11 |
Opened Tohoku sales office & oil terminal (Ishinomaki, Miyagi) |
| 2015-02 |
創業満５０周年記念日を迎える |
| 2015-02 |
The 50th anniversary of its founding |
| 2016-04 |
和歌山営業所移転（和歌山県岩出市） |
| 2016-04 |
Moved Wakayama sales office (Iwade, Wakayama) |
| 2017-08 |
姫路市網干区の油槽所・工場内に新たに技術センター棟を建設 |
| 2017-08 |
Built New technology center building in the area of Himeji asphalt terminal & polymer modified asphalt plant (Aboshi, Himeji, Hyogo) |
| 2018-04 |
沖縄油槽所1,500tアスファルト備蓄タンク設置 |
| 2018-04 |
Installed 1,500t of asphalt storage tank in Okinawa bitumn terminal |
