| 1910 | - Company formed.Completed five-horsepower induction motor
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| 1911 | - Completed 2-kVA transformer
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| 1914 | - Started production of AC ammeter and voltmeter
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| 1916 | - Completed 10,000-hp (7,355-kW) water turbine
- Started production of fans
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| 1924 | - Completed the first large-scale DC electric locomotive to be manufactured in Japan
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| 1930 | - Started production of pole-top transformers
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| 1931 | - Completed 10,000-A hydraulic electrolytic cell
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| 1932 | - Started production of elevators
- Completed Hitachi's first electric refrigerator
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| 1933 | - Completed 23,600-horsepower Illgner set
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| 1940 | - Completed 5,000-line automatic private branch exchange
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| 1943 | - Completed 85,000-kW Francis water turbine and 70,000-kVA alternating current generator
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| 1949 | - Completed first U05 power excavator
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| 1951 | - Completed 6,500-kW Kaplan water turbine and 7,000-kVA AC generator (first umbrella-type generator made in Japan)
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| 1952 | - Completed 21,000-kW two-stage pump-turbine
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| 1953 | - Completed true low-pressure 300-m3/h air separation machine
- Completed 55,000-kW hydrogen-cooled turbine
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| 1954 | - Completed the first large-scale cold strip mill to be produced in Japan
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| 1955 | - Completed 100,000-kW Francis water turbine and 93,000-kVA alternating current generator
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| 1956 | - Completed the first DF90 diesel-electric engine to be built in Japan
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| 1958 | - Completed six-transistor miniature portable radio
- Electron microscopes awarded the grand prix at the World Exposition in Brussels
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| 1959 | - Completed electronic computers based on transistors
- Hitachi America, Ltd. established
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| 1960 | - Developed cubic-type refrigerator
- Completed seat reservation system (MARS-1) for Japanese National Railways
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