- 1907
- Ishimatsu Ohara establishes Ohara Chuzosho (Foundry) for the purpose of casting drilling equipment components.
- 1924
- Ohara Chukosho is established with a machining plant and an assembly plant and it begins production of complete machines.
- 1932
- Ohara receives an order of mud pumps from Nippon Oil Co., Ltd. and forms the basis of business that focuses on oil drilling equipments.
- 1938
- Fujimatsu Ohara moves the plants and establishes Ohara Tekkosho.
- 1939
- Tokyo branch Takahama plant is established.
- 1940
- Ohara Tekkosho Ltd. is established and Fujimatsu Ohara assumes the representative executive.
- 1944
- Plate work/welding plant and forge plant are built and the integrated system of production for ironworks is established.
Takahama plant is closed due to fire during the war, and Tokyo branch is moved to Yushima, Tokyo.
- 1945
- Ohara Tekkosho is reorganized to Ohara Corporation.
Ohara sees the importance of domestic resources development and begins development of water gate equipments for irrigation and hydroelectric power generation.
- 1947
- Electricity department is newly created which is designed for electrical work for transformation and transmission.
- 1950
- Development and sales of slime pumps for transporting mine slime, dust coal and heavy oil are launched.
- 1951
- Development of snow vehicles commissioned by Niigata Prefecture is launched and the first prototype “Fubuki” is completed.
- 1952
- Fubuki is adopted by National Police Agency and serial production starts.Ohara wins Niigata Technology Award for development of snow vehicles.
- 1953
- Prototype of snow vehicles for the Self-Defense Forces is produced through joint research with Technical Research and Development Center of Japan Defense Agency.
- 1954
- A self-propelled test boring machine for searching oil mine is developed.
- 1957
- Technical partnership with Neyrpic (France) is entered into, and an automatic water-level control gate for irrigation drainage is produced and sold.
Ohara celebrates its 50th year in business, and Matsuo Ohara assumes the president.
- 1959
- Environmental business begins with development of high-speed treatment equipment for night soil.
A rotary vacuum filtration system for wastewater treatment is developed.
Ohara wins the National Invention Award for achieving the practical use of the snow vehicles.
- 1960
- Ohara wins the award from Director-General of the Science and Technology Agency for development of snow vehicles.
- 1963
- A rotary snowplow for railroad is developed.
- 1965
- Electricity department is spun off and Ohara Dengyo Co., Ltd. is established.
Niigata Koshuuha Kogyo Co., Ltd. is established for high-frequency hardening treatment.
- 1967
- Hokkaido office is established with the expansion of sales of snow vehicles as heavy-snow countermeasures by Economic Planning Agency.
Kurojo plant is constructed to expand plate work/welding plant.
Newly developed compact snow vehicle is adopted by 9th Japanese Antarctic Research Expedition.
- 1968
- A self-propelled hydraulic dust collector for intake dam of power plant is developed and delivered.
- 1969
- A serge absorber and a hydrant pit for aircraft refueling facilities are developed and delivered.
Technical partnership with Schleuniger (Swiss) is entered into, and production of Ratrac groomers is launched.
- 1970
- Technical partnership with National Supply Company (the U.S.) is entered into, and production and sales of the triplex slush pump for oil drilling start in Japan.
A chain drive filter for sludge dehydrator is developed.
- 1972
- Ohara becomes an official supplier of snow groomers for Sapporo Winter Olympic Games.
- 1973
- A surplus sludge treatment/dehydration equipment and MSP filter are developed.
- 1976
- Dispatch of an employee as a member of a wintering party of the Japanese Antarctic expedition party begins.
- 1977
- Welding technology for hydraulic steel pipes for power plant is established.
A water treatment system with a wire mesh screen for irrigation is developed.
- 1980
- Drilling equipments for geothermal energy development and energy production equipments are produced.
- 1981
- A hydraulically powered snow groomer is developed and its production begins.
- 1985
- A hydraulically powered snow groomer is developed and its production begins.
- 1986
- Disc valve equipments for irrigation are manufactured and sold through a technical partnership with Nertec (France).
- 1989
- Production and sales of a hot spring drilling rig begins.
- 1990
- A large-size snow vehicle for Antarctic observation that can be used in temperatures up to minus 90 degrees is completed and delivered.
- 1993
- FRP plant is constructed for production of new snow groomers.
The concept machine DL270 is completed and it wins Japan’s Good Design Award and the award from the Director-General of the Small and Medium Enterprise Agency.
- 1994
- A water treatment system with a wire mesh screen for irrigation is developed and sold.
- 1996
- A screw-press sludge dehydrator is developed.
- 1998
- Technical partnership with Zaugg (Swiss) is entered into, and Ohara begins the import and sale of half-pipe grooming attachments.
Ohara receives ISO 9001 quality control certification.
Loss of Matsuo Ohara. Okito Ohara assumes the president.
- 2000
- License agreement with West Salem Machinery Co. (the U.S) for recycling machines is entered into, and production and sales start.
- 2001
- License agreement with Bulk Handling Systems (the U.S.) for recycling machines is entered into, and production and sales start.
- 2002
- Ohara acquires rights to produce and market the snow groomers of Logan Manufacturing Company (the U.S.).
- 2003
- Ohara is ranked “A” for sewage-treatment plant construction work by Japan Sewage Works Agency.
License agreement with コマー (the U.S.) for recycling machines is entered into, and production and sales start.
- 2004
- Ohara receives ISO 14001 environmental certification.
Import and sales agreement with SSI Shredding Systems, Inc. (the U.S.) is entered into.
- 2005
- Technical partnership with Snow tech. Co. (Korea) for indoor snowmaking machine is entered into, and sales start.
- 2006
- Ohara acquires the Digging Equipment Div. From Niigata Tekkosho.
- 2009
- Osaka branch is established with the expansion of plant projects.
- 2010
- License agreement with Aztec SAS (France) is entered into and Aztec begins production of the snow groomers in France.
A digestion gas power generating system is co-developed with Nagaoka University of Technology.
