- E.H. Hunter, of Northern Ireland, founded the Osaka Iron Works (proprietorship) on the Ajikawa riverbank, Osaka.
- The Hatsu Maru (14GT wooden ship), the first new ship, is constructed.
- Kumagawa Maru, Japan's first steel-hulled ship, is built for Osaka Shosen (now Mitsui O.S.K. Lines).
- Sakurajima Works starts operations (relocated to the Ariake Machinery Works in September 1997).
- Japan's first Western-style whaling ship, the No. 2 Hogei Maru, is constructed.
- Tokyo liaison office is opened.
- Japan's first tanker, the Tora Maru constructed.
- Innoshima Works starts operations.
1914 ~ Old Osaka Iron Works Ltd. era
- Osaka Iron Works is reorganized as a joint-stock company.
- Chikkou Works starts operations.
- Dojima Ohashi, an arch bridge, and other structures are completed in succession for the municipal government of Osaka.
- The Heiyo Maru and Heian Maru large-scale cargo and passenger ships for Nippon Yusen K.K. are constructed (these ships established a new record for river launches in Japan).
1934 ~ New Osaka Iron Works Ltd. era
- The company makes a new start as Osaka Iron Works incorporated (marking the incorporation of the current Hitachi Zosen Corporation) .
- Osaka Tekko, a technical journal, is inaugurated.
1943 ~ As Hitachi Zosen Corporation
- The name is changed to Hitachi Zosen Corporation.
- Mukaishima Works starts operations.
- Kanagawa Works starts operations.
- Hitachi Zosen Technical Review is inaugurated.
- Technical Research Institute is opened.
- The first whaling ship is constructed for Norway following World War II as a result of government trade.
- A technological tie-up for B&W-type diesel engines is concluded.
- The first B&W marine diesel engine is completed.
- Offices are opened in London and New York.
- A technological tie-up is concluded with Von Roll Environmental Technology Ltd. of Switzerland for a De Roll type refuse incineration plant.
- A De Roll-type refuse incineration plant is completed for the municipal government of Osaka (the first mechanical incineration plant with power generation facility manufactured in Japan).
- Sakai Works starts operations.
- Sakurajima Works restarted as a specialized plant for land machinery.
- A number of orders are completed for De Roll-type refuse incineration plants for Tokyo Metropolis.
- Maizuru Works starts operations.
- Ariake Works starts operations.
- Construction is completed for a 500,000-ton tanker for Esso.
- Ariake Land Machinery Works starts operations.
- Hitachi Zosen celebrates its 100th anniversary.
- The world's first multiple-face shield tunneling machine is completed.
- Construction of ultra-large steel mill plants is completed for Baoshan Iron and Steel of China and Sicartsa Steel Mill in Mexico
- Ibaraki Works starts operations.
- Construction of Japan's first double-hull VLCC is completed.
- Sakai Works starts operation as a specialized plant for steel structures.
- Slurry-shield tunnel boring machine (with one of the world's largest diameters of 14.14m) is produced.
- The world's first triple-face shield tunneling machine is completed.
- A refuse incineration plant for the Clean Association of Eastern Saitama District receives MITI (now METI) Minister prize for excellent environmental equipment.
- Electric power supply business is inaugurated.
- Japan's first super refuse-fired power generation plant comes on stream.
- An order is received for the world's first fifth-generation semisub rig.
- Sakurajima Works is closed, and facilities are transferred to Ariake Works; Ariake Machinery Works starts operations.
- The world's largest B&W marine diesel engine (74,640 hp) at the time is completed.
- An order is received for the No.1 gasification melting furnace.
- Yumemai Ohashi, the world's first floating swing bridge is constructed.
- 8,000 hours of continuous operations are achieved by refuse incineration plant delivered for Taiwan.
- A large-scale desalination plant is constructed in Saudi Arabia.
2002 ~ Newborn "Hitz" Hitachi Zosen
- The Basic Agreement on Consolidation of Shipbuilding Operations is concluded with NKK Corp (now JFE Steel Corporation).
- The shipbuilding operation is transferred to Universal Shipbuilding Corporation on October 1.
- The Hitz brand name goes into use as of October 1.
- HEC Corporation is acquired.
- The world's most advanced electronic controll marine engine for large vessels is produced.
- A desalination plant is constructed for Oman.
- Kyoto Municipal Waste Edible Oil Fuel Production Facility is completed with the greatest manufacturing capacity in Japan.
- Refuse incineration plant is constructed for Odate City (the first intermediate processing operation of municipal refuse in Japan under PFI legislation).
- A desalination plant is constructed in Abu Dhabi.
- One of Japan's largest gasification melting furnace is completed for Toyoda City.
- A new factory is constructed in Sakai Works for extension of industrial machinery and shield tunneling machinery production.
- Ten Group companies are absorbed.
- Completed a new plant for manufacture of medium-sized diesel engines at Ariake Works.
- Launched a joint venture in China for manufacture of marine diesel engines.
- Launched a joint venture in China for manufacture of marine deck machinery.
- Acquired European refuse incineration plant maker(current name: Hitachi Zosen Inova AG).
- Hitachi Zosen celebrates its 130th anniversary.
- Establishes local subsidiary in India.
- Vessel put into service employing world's first selective catalytic reduction (SCR) NOx removal system for marine engines compliant with IMO Tier III NOx emission standards.
- Established a joint-venture manufacturer of process equipment in India.
- Precision Machinery Center is completed.
- Shield tunneling machine with world's largest diameter, at 17.45 m, is completed for Seattle, Washington
- Acquired all shares of U.S.-based NAC International Inc.
- Established local subsidiary in Myanmar.
- Established local subsidiary in Indonesia.
- Daiki Ataka Engineering Co.,Ltd is acquired.
- SCR system for marine engines received world's first FTA approval.
- Company expands into retail electricity market as power producer and supplier (PPS) with power produced from renewable energy.
- Omonogawa Wind Power Station is completed, starts operations under Omonogawa Wind Power Co., Ltd.
- Acquired shares of "Osmoflo Group".
- Long-term Hitz 2030 Vision and medium-term management plan Change & Growth start.
- Established local subsidiary in Thailand.
- Company becomes Japan's first issuer in manufacturing industry of Hitachi Zosen Green Bonds.
- Joint-venture company aimed at expanding our service business in China is formed.
- Hitz Advanced Information Technology Center (A.I/TEC) starts operations.
- Completion of Phase 1 construction ,the world largest WtE Plant in Changsha China.
- The New Medium-term Management Plan "Foward 22" started.
- Completed Japan's first undersea installation type flap gate type floodgate installation work for Iwate Prefecture.
- Hitachi Zosen celebrates its 140th anniversary.
- 'PtG Square' starts operations in the Chikko Works.
- Established Underground Infrastructure Technologies Corporation (UGITEC), a joint venture with Kawasaki Heavy Industries for the shild machine business.
- Hitachi Zosen Inova AG acquires shares in Steinmüller Babcock Environment Group and makes it a subsidiary.
- Selected as a DX Certified Operator by the Ministry of Economy, Trade and Industry.
- Signing of the UN Global Compact.
- The New Medium-term management plan "Forward 25" start.
- Established Hitachi Zosen Marine Engine Co., Ltd.
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