Manko Manufacturing Co., Ltd.

Established Ishihara Manufacturing in Azabu-Kita, Minato-ku, Tokyo, and began manufacturing machine parts and cutting tools.

Established Ishihara Manufacturing in Azabu-Kita, Minato-ku, Tokyo, and began manufacturing machine parts and cutting tools.

Renamed to Manko Manufacturing and became a cooperative factory of Nakajima Aircraft Co., Ltd. Tokyo plant, starting production of engine-related jigs and special tools.

Renamed to Sankō Seisakusho, became a cooperative factory of Nakajima Aircraft Co., Ltd. Tokyo Factory, and began producing engine-related jigs and specialized tools for the company.

Relocated the Tokyo office to 2-25-14 Nishiazabu, Minato-ku, Tokyo due to wartime damage.

Due to wartime damage, relocated the Tokyo office to 14-25-2 Nishiazabu, Minato-ku, Tokyo.

Commenced manufacturing of cutting tools and began production and sales of end mills, reamers, cutters, etc. under the S&K brand.

Commenced manufacturing cutting tools, launching production and sales of end mills, reamers, cutters, etc. under the S&K brand.

Reorganized as a corporation, becoming Manko Manufacturing Co., Ltd.

Reorganized as a corporation, becoming Sankō Seisakusho Co., Ltd.

Constructed the Nitta factory at 170, Kizaki, Nitta-cho, Nitta-gun, Gunma-ken, the current headquarters location.

Constructed a Nitta factory at 170 Kizaki, Nitta-machi, Nitta-gun, Gunma Prefecture, the current headquarters location.

Relocated headquarters to 170, Kizaki, Nitta-cho, Nitta-gun, Gunma-ken; the former headquarters became the Tokyo office.

Moved headquarters to 170 Kizaki, Nitta-machi, Nitta-gun, Gunma Prefecture; the former headquarters became the Tokyo office.

Introduced vacuum hardening and vacuum annealing furnaces.

Introduced vacuum hardening furnace and vacuum annealing furnace.

Opened the Nagoya office at 2-4-14 Kanayama, Naka-ku, Nagoya.

Opened Nagoya office at 14-4-2 Kanayama, Naka-ku, Nagoya City.

Expanded Polishing Plant 1 at headquarters.

Expanded the first polishing plant at headquarters.

Expanded Polishing Plant 2 at headquarters.

Expanded the second polishing plant at headquarters.

Obtained ISO 9001 certification.

Obtained ISO 9001 certification.

Received the Nakagawa Iwo Technical Encouragement Award from Gunma Prefecture's "One Company, One Technology" program.

Upgraded the vacuum hardening furnace.

Received the Gunma Prefecture 'One Company One Technology' Nakagawa Iwo Technology Encouragement Award.

Updated the vacuum hardening furnace.

Upgraded the vacuum annealing furnace.

Updated the vacuum annealing furnace.

Opened a Western SOHO.

Established a West SOHO.

Opened a Tohoku SOHO.

Established a Tohoku SOHO.

Opened a Chubu SOHO.

Established a Chubu SOHO.