| 1947 |
- Mitsubishi Metal Mining Co., Ltd. (now, Mitsubishi Materials Corporation) started to manufacture rock tools.Rock Tools
 Mitsubishi Metal Mining Co., Ltd. |
| 1958 |
- Ote Kosan CO., Ltd. was established as the subsidiary company of Mitsubishi Metal Mining Co., Ltd. .
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| 1960 |
- Shinagawa plant was established and started to manufacture cemented carbide materials.Carbide Materials
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| 1961 |
Niigata plant was established and started to manufacture sintered products. |
| 1973 |
- Mitsubishi Metal Mining Co., Ltd. (now, Mitsubishi Materials Corporation) started to manufacture wear resistant tools.Wear Resistant Tools
 WEAR RESISTANT TOOLS Catalogue (From Left1985, 1997, 2001) WEAR RESISTANT TOOLS in 1985 |
| 1981 |
- Gifu plant of OTE Kosan CO., Ltd.(now, MMC RYOTEC Corporation) was established and started to manufacture rock tools and wear resistant tools, etc.Rock ToolsWear Resistant Tools
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| 1988 |
- Shinagawa plant of OTE Kosan CO., Ltd. moved to Ibaraki prefecture.Carbide Materials
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| 1990 |
- The name of the company was changed from of OTE Kosan CO., Ltd. to OTE Technological Engineering Corporation
 OTE Technological Engineering Corporation, Gifu Plant |
| 1991 |
- PMC (Precision Mold Center) was established in Niigata and started to manufacture precision molds and tools.
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| 1994 |
- Techno OTE Kako Co., Ltd. (Capital : 50 million JPY) was established and Moriya production department was organized at Ibaraki plant to manufacture cutting tool holders.
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| 1996 |
- The capital of Techno OTE Kako Co., Ltd. was increased by 60 million JPY by Mitsubishi Materials’ capital participation.
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| 1997 |
- Techno OTE Kako CO., Ltd. changed its company name to RYOTEC CO., Ltd.
- Akenobe Seiko Company Ltd. in Hyogo prefecture was acquired by RYOTEC CO., Ltd.
- OTEC (THAILAND) CO., Ltd. was established to manufacture rock tools.Rock Tools
 OTEC(THAILAND) 2005-2007 OTEC(THAILAND) as of today |
| 1998 |
- Capital of RYOTEC CO., Ltd. was increased by 90 million JPY and the total capital became 200 million JPY.
- OTEC (THAILAND) started to manufacture rock tools.Rock Tools
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| 1999 |
- Niigata plant changed its name to Niigata office.
- Moriya production department of Ibaraki plant was separated as Moriya plant.
- Ibaraki plant obtained the ISO14001 certification.
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| 2000 |
- Niigata office was transferred to PM Techno CO., Ltd..
- The manufacturing departments of wear resistant tools and rock tools were transferred from Mitsubishi Materials Corporation to RYOTEC Co.,Ltd.Rock ToolsWear Resistant Tools
- Wear resistant tools, rock tools and Gifu plant of RYOTEC Co.,Ltd. obtained ISO14001 certification.Rock ToolsWear Resistant Tools
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| 2001 |
- Gifu plant of Ryotec Co.,Ltd. changed its name to carbide manufacturing plant.Carbide Materials
- Wear resistant tools and Rock tools plant won the excellence TPM (Total Productive Maintenance) award.Rock ToolsWear Resistant Tools
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| 2002 |
- Moriya plant was transferred to MMCTOOLING Corporation.
- Hiroshima Plant was established.
- Carbide manufacturing plant changed its name to Ikeda plant.Carbide Materials
- Wear resistant tools plant changed its name to Wear resistant tools division.Wear Resistant Tools
- Rock tools plant changed its name to Rock tools division.Rock Tools
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| 2003 |
- OTEC (THAILAND) obtained the ISO9001 certification.Rock Tools
- Tokyo head office was relocated to Gifu Prefecture.
- Carbide manufacturing department of Ibaraki plant was transferred to MMC Hard Materials CO., Ltd.Carbide Materials
 MMC Hard Materials Corporation |
| 2005 |
- Wear resistant tools and rock tools division obtained the ISO9001 certification.Rock ToolsWear Resistant Tools
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| 2007 |
- Merges Akenobe Seiko Company into RYOTEC Co.Ltd. and established as Akenobe plant.
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| 2009 |
- OTEC(THAILAND) was relocated to expand production capacity.Rock Tools
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| 2011 |
- RYOTEC CO., Ltd. and MMC Hard Materials CO., Ltd. merge to form MMC RYOTEC Corporation.
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| 2018 |
- Marketing & Development Division was reorganized to Research & Development Division.
- Quality Assurance Division was established.
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| 2020 |
- Business Planning Division was established.
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| 2021 |
- Engineered Carbide Products Sales Department of Mitsubishi Materials Corporation was transferred to MMC RYOTEC Corporation as of April 1st.Rock ToolsWear Resistant ToolsCarbide Materials
- Plant & Equipment Engineering Division ,Safety & Environment Control Department and Compliance & Governance Development Department were established from the administration division.
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| 2022 |
- Cemented Carbide Manufacturing Division was established by the unification of development function and manufacturing function.
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