| 1926 |
Kakusaburo Okamoto established the Okamoto Special Purpose Machine Tool Works as a privately owned company.
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| 1930 |
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| 1953 |
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| 1955 | Okamoto developed the slicing machine PSG-3GE. | |
| 1957 |
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| 1959 |
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| 1961 |
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| 1963 | Okamoto Machine Tool Works, Ltd. was listed on Tokyo Stock Exchange, 2nd Section. | |
| 1968 |
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| 1972 | Okamoto established USA subsidiary Okamoto Corporation. | |
| 1973 | Okamoto extabilished Singapole subsidiary Okamoto (Singapore) Pte, Ltd in Singapore. | |
| 1982 | Okamoto's Annaka Plant in Gunma Prefecture completed. | |
| 1987 | Okamoto established Thailand subsidiary Okamoto (Thai) Co.,Ltd. | |
| 1991 | Okamoto entered an engineering and marketing collaboration agreement with The Gleason Nishyo Co., Ltd merged with Okamoto Machine Tool Works Co., Ltd. | |
| 1992 | Okamoto established German subsidiary Okamoto Machine Tool Europe GmbH in Germany. | |
| Shibayama Machine Co.,Ltd merged with Okamoto Machine Tool Work Co.,Ltd. | ||
| 1994 | MCS merged with Okamoto Machine Tool Work Co.,Ltd. | |
| 2001 |  Okamoto
developed the semiconductor back-grinding machine GNX-300 for super
slim 300mm (12 inches) silicon weaher. |
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| 2002 | Okamoto estabilished subsidiary Okamoto (Shanghai) Co.,Ltd. |
Okamoto
developed Japan's first Gear Grinding Machine ASG-2.
Okamoto
developed the column type cross feed surface Grinding machine
Model PSG-6.
Okamoto
developed Internal Grinding Machine Model IGM-1E.
Okamoto
developed the Profile Surface Grinding Machine Model OCG-2.
Okamoto
developed Gear Grinding Machine Model SHG-2 (Picture) with worm-type
grinding wheel.
Okamoto
developed the CNC Forming Surface Grinding Machine NFG-5 for the
first time all over the world.
