| 1943-04 |
April 1968: Registered as a surveying contractor |
| 1943-07 |
Founded as a limited partnership, Kawasaki Trial Drilling Machine Manufacturing Company. |
| 1943-07-22 |
Founded: July 22, Showa 18 (1943). |
| 1948-04 |
April 1973: Established the Marine Survey Section (now Marine Survey Group) within the Physical Exploration Department to expand into marine survey operations |
| 1951-08 |
Established Kawasaki Boring Co., Ltd. (capital 500,000 yen) Tokyo branch (now Kanto branch) at 3-7 Koshien, Kyobashi, Chuo-ku, Tokyo for boring work and geological surveys. |
| 1952-04 |
April 1977: Established the Hyogo Office (now Kobe Branch) |
| 1954-04 |
April 1979: Established the Matsuyama Office (now Shikoku Branch) |
| 1955-07 |
Established Osaka office (now West Japan branch). |
| 1957-02 |
February 1982: Established the Kanagawa Office (now Yokohama Branch) |
| 1957-06 |
Established Kyushu office (now Kyushu branch). |
| 1959-03 |
March 1984: Established the Saitama Office (now North Kanto Branch) |
| 1959-04 |
Established Nagoya office (now Chubu branch). |
| 1961-03 |
March 1986: Established the Sapporo Office (now Hokkaido Branch) |
| 1963-01 |
Established Sendai branch office (now North Japan branch). |
| 1964-10 |
Registered as a construction consultant. |
| 1968-04 |
Registered as a surveying company. |
| 1969-01 |
Established Hiroshima branch office (now China branch). |
| 1970-04 |
Established a Physical Exploration Department (now Marine & Energy Division) within the headquarters to expand into physical exploration services. |
| 1973-04 |
Within the Physical Exploration Department, established a Marine Survey Section (now Marine Survey Group) to expand into marine survey services. |
| 1974-11 |
Moved headquarters to 1-11-1 Omori Kita, Ota-ku, Tokyo. |
| 1976-10 |
Established Niigata sales office (now Hokuriku branch). |
| 1977-04 |
Established the Hyogo Office (now Kobe Branch). |
| 1979-04 |
Established the Matsuyama Sales Office (now Shikoku Branch). |
| 1982-02 |
Established the Kanagawa Sales Office (now Yokohama Branch). |
| 1984-03 |
Established the Saitama Sales Office (now North Kanto Branch). |
| 1986-03 |
Established the Sapporo Sales Office (now Hokkaido Branch). |
| 1997-07 |
July 1997: Registered shares with the Japan Securities Association (now Tokyo Stock Exchange JASDAQ) |
| 1997-07 |
Registered shares with the Japan Securities Association (now listed on the Tokyo Stock Exchange JASDAQ). |
| 1997-11 |
November 1997: Obtained ISO 9001 certification at the Kanto Branch |
| 1997-11 |
Obtained ISO 9001 certification at the Kanto Branch. |
| 1998-05 |
Established Cultural Heritage Investigation Consultant Co., Ltd. (affiliate) for geological and soil surveys using microfossil analysis and cultural property investigations. |
| 1999-04 |
Moved headquarters and East Japan Branch (now Kanto Branch) to 2-11-15 Mita, Minato-ku, Tokyo. |
| 2000-05 |
May 1998: Established Cultural Heritage Survey Consultant Co., Ltd. (affiliate) for geological, soil, and cultural heritage surveys using a microfossil analysis laboratory |
| 2003-01 |
Received designation as a designated investigation agency under the Soil Contamination Control Act. |
| 2003-04 |
April 1999: Moved headquarters and Eastern Japan Branch (now Kanto Branch) to 2-11-15 Mita, Minato-ku, Tokyo |
| 2013-01 |
Heisei 15, January: Designated as a designated investigation agency under the Soil Pollution Countermeasures Act. |
| 2013-07 |
Heisei 25, July: Listed on the Tokyo Stock Exchange JASDAQ following the market integration of Osaka and Tokyo Stock Exchanges. |
| 2013-07 |
Listed on the Tokyo Stock Exchange JASDAQ following the market integration of the Osaka and Tokyo Stock Exchanges. |
| 2013-11 |
Heisei 15, November: Obtained ISO9001 certification for all facilities. |
| 2014-12 |
Heisei 26, December: Established a Hanoi overseas office. |
| 2014-12 |
Established a Hanoi Resident Office. |
| 2017-10 |
Heisei 29, October: Established OHYA UNDERGROUND ENERGY Co., Ltd. (affiliate) to supply heat using groundwater from the former Otani stone quarry site. |
| 2017-10 |
Established OHYA UNDERGROUND ENERGY Co., Ltd. (affiliate) to provide heat supply using groundwater from the former Ohya Quarry site. |
| 2022-12 |
Reiwa 4, December: Made Union Consultant Co., Ltd. a subsidiary to strengthen geological and soil survey operations in Hokkaido and contribute to the region. |
| 2022-12 |
Made Union Consultant Co., Ltd. a subsidiary to strengthen geological and soil survey operations in Hokkaido and contribute to the community. |
