| Company name | Group | Parent | Subsidiary | Customer | Supplier | Alliance | Bank | Shareholder |
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| Sanritsu Great International Corp. | ||||||||
| 八十二長野銀行 | ||||||||
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Established Hirota Manufacturing Co., Ltd. Started manufacturing fixed resistors as a partner company of Fujitsu Co., Ltd. Suzaka Factory
Started manufacturing magnetic disk device related parts as a partner company of Fujitsu Co., Ltd. Nagano Factory
Established a new electronic device design and manufacturing division
Established Matsukawa Factory in Matsukawa Industrial Park and relocated the electronic device manufacturing division
Established a workshop building at Matsukawa Factory
Established a cleanroom at the headquarters factory
Obtained ISO 9001:1994 certification
Established EMS division (Electronics Manufacturing Service)
Obtained Eco-Action 21 certification
Started solar power generation at Matsukawa Factory
Started selling in-house developed HDD/SSD evaluation equipment (SMART TESTER Series)
Obtained ISO 9001:2008 certification
Started selling SSD burn-in test equipment
Started selling temperature and humidity controlled HDD/SSD test equipment
Start of sales of servo writer equipment
Integrated the head office factory into Matsukawa factory and established a new technology building.
Obtained ISO 9001:2015 certification.
Registered as a Nagano Prefecture SDGs promotion company.
Established a new experimental building at the head office factory.
Completion of interior renovation of the technology building at the head office factory: interior redesign of the technology building.
Nagano Prefecture 'Ikigai Workplace Advance Company': Work-Life Balance: ★: Certification obtained.
Nagano Prefecture 'Ikigai Workplace Advance Company': Advance Plus: ★: Certification obtained.
Due to in-house training, our company will change working hours to 8:30–12:30 on Friday, October 30, 2026, and will be temporarily closed on Monday, November 2, 2026. Emails and faxes received during the training period will be addressed sequentially from Wednesday, November 4, 2026, onward.
On October 27, 2026, HIROTA News Letter Vol.68 was released. The content this time is "Physical AI (Part 2)".
We updated the website's PHP program to the latest version and strengthened security. We have informed that a safe browsing environment has been established.
Kohara Seisakusho Co., Ltd. will exhibit at the 'Industrial Fair in Shinshu 2026' held on October 23-24, 2026, at Nagano City Big Hat. The booth is located at Technology Zone Te-29, where the company will showcase its manufacturing technology. Admission is free and no prior registration is required.
Kohara Manufacturing Co., Ltd. obtained the Advance Plus certification of 'Workplace Ikikiki Advance Company' as of October 1, 2026. The certification ceremony was held at Kohara Manufacturing's headquarters on the same day, and the certificate was received from Director Imai of the Nagano Prefecture Hokushin Local Government Office.
At the 5th Manufacturing ODM/EMS Expo, many visitors visited the Hirota Manufacturing's booth, and the event ended in great success. We achieved first place in pre-search and view counts, and we express our gratitude to those who showed interest in our technology and services. We provide comprehensive support from electronic circuit design to product assembly and inspection, and we accept inquiries regarding the exhibition content.
On September 29, 2026, HIROTA News Letter Vol.67 was released. The content this time is 'Physical AI (Part 1)'.
HIROTA News Letter Vol.66 has been released. This issue covers the current status of supply constraints and price revisions for key materials.
Kohara Manufacturing Co., Ltd. will observe a summer holiday from Wednesday, August 12, 2026, to Friday, August 14, 2026. Regular business operations will resume on Monday, August 17, 2026.
On July 22, 2026, HIROTA News Letter Vol.65 was released. This issue covers 'Manufacturing World Tokyo 2026'.