On December 7, 1935, based on the abrasive material developed at RIKEN, RIKEN Corundum Co., Ltd. was established in the same laboratory for domestic production of abrasive materials. (Komagome, Hongo-ku, Tokyo)

Oji factory completed in Kita-ku, Tokyo, moved from RIKEN

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  Oji factory

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  Oji factory

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  Oji factory

Acquired the mining right of the Garnet mining area of ​​Kawaba village in Gunma prefecture, and built Numata factory.

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  Numata Factory

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  Numata Factory

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  Sand factory

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  garnet

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  Crushed stone

Electrostatic coating equipment completed. (Patent: Receiving the incentive for Industrial Technology Institute)

We obtained research grant from MITI, completed special precision abrasive paper production facility

Completed integrated manufacturing equipment for wide belts at the Oji factory

The stock is listed on the Tokyo Stock Exchange second part

Constructed the Konosu factory in Konosu City, Saitama Prefecture

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  Konosu factory

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  Konosu factory

Technical tie-up with Norton USA Inc., established a joint venture Riken Norton Co., Ltd.

Succeeded in domestic production of zirconia products for the first time, started manufacturing and selling

RIKEN Norton Co., Ltd. became a wholly-owned subsidiary and changed its name to RIKEN

RIKEN Co., Ltd. was merged with RIKEN Corundum Corporation

Constructed "RIKEN Kamiya Building" in the site of Oji Plant and now lease to AEON RETAIL Co., Ltd.

Resolved technical partnership with Norton USA

Construction of the Niiharu factory in Niiharu village, Tone-gun, Gunma prefecture

Established "Zibo Riken Taishan Painting Fixture Co., Ltd.", a manufacturing and sales company of abrasive cloth paper manufacturing and sales in Shandong Province, China.
Established "RIKEN Precision Equipment (Suzhou) Co., Ltd." in Jiangsu Province, China, a subsidiary manufacturing and selling OA equipment parts and others.

Acquired ISO 9001 certification.

Acquired ISO 14001 certification.

Established RIKEN Hong Kong Co., Ltd. (Hong Kong, People's Republic of China), a sales subsidiary of OA equipment and others.
Acquired shares of a manufacturing and selling company such as abrasive cloth paper "Koukan Co., Ltd." (Shiroka Town, Saitama Prefecture, Minami Saitama district), making it a subsidiary.

Opened the Los Angeles branch in the United States.

Expansion of Konosu factory new processing plant building

Perform a capital and business alliance with Okamoto Corporation

The 80th anniversary commemoration event was held at Konosu factory

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  State of the event

Relocate Tokyo branch to Taito-ku, Tokyo, relocate Nagoya Sales Office to East District of Nagoya-shi, Aichi prefecture
Northern Japan office opened.
Become a subsidiary of Okamoto Corporation.