| Company name | Group | Parent | Subsidiary | Customer | Supplier | Alliance | Bank | Shareholder |
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| Kitami Electro | ||||||||
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| 三谷伸銅販売株式会社 | ||||||||
| Shin Kitami Corporation | ||||||||
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Second generation of the Matsutani family, Zenroku, moved from Kaga Province to Kyoto and started a charcoal business (Meiwa–An'ei period, 1770s)
Constructed the former Yokohama factory, modernizing the previously home-based industrial operation by utilizing the hydraulic power of the Sōsui Canal
Established the Mitani Gōmei Company
Reorganized into Mitani Shindo Co., Ltd. (capital 1,000,000 yen)
Opened a Tokyo branch office
Promoted to Tokyo branch
Built the current headquarters and National Route factory at the present site (National Route 1, 10th Avenue South), expanding rolling facilities in response to increased demand for non-ferrous metal products alongside munitions production
Relocated headquarters to the National Route factory
Renamed to Mitani Aviation Metal Co., Ltd.: designated as a munitions factory, meeting the needs of the Army, Navy, and Air Force
After the war, quickly shifted to civilian production, reverted the company name to Mitani Shindo Co., Ltd., and strengthened the technical team
JIS display permit (Permit No. 518 for extended copper products)
Obtained permission for a bonded factory
Delivered 10-yen bronze coins for the 1964 fiscal year and 1,000-yen silver commemorative coins for the Tokyo Olympics to the Mint
Received the Osaka Trade and Industry Bureau Director's Award as an excellent factory implementing industrial standardization
Received an award as an export-contributing company
Built an aluminum factory on the west side of the current headquarters, began producing aluminum alloy products, and supplied medal material for the Expo to the Mint
Delivered 5-yen brass coins to the Mint, continued deliveries thereafter, and completed the "Mitani Overpass Bridge"
Signed a business agreement with Mitsui Mining & Metals Co., Ltd. and Mitsui & Co., Ltd.; through a second-round private placement, doubled the capital, securing both companies' investment and strengthening the company's structure
Delivered a commemorative copper medal round for the Sapporo Olympics to the Mint, exported foreign coin rounds (Thailand, Indonesia, etc.)
Commenced wastewater treatment and environmental monitoring services (formerly San Tan Analysis Center)
Received the Industrial Technology Institute Director's Award as an exemplary industrial standardization facility, delivered a commemorative Okinawa Marine Expo medal round to the Mint, delivered a 50-yen white copper coin round to the Mint
Expanded export of foreign coin rounds (Middle East, Africa, and others), pioneered fields such as forged and pressed materials, nail materials, aluminum shapes, and their processed products as secondary products
Separated the sales division and established San Tan Shindo Copper Sales Co., Ltd.
Established Kitami Electro and entered the surface treatment processing business
Established New Kitami and inherited Kitami Electro's business
Integrated San Tan Shindo Copper Sales Co., Ltd. (sales transfer)
ISO9001 certification obtained (copper alloy rods and wire products)
KES Environmental Management System Step 2 certification obtained
100th anniversary of establishment
Becomes CK Sanetsu Group Co., Ltd.
New Kitami Co., Ltd. absorbed and merged
The location name for Mitani Copper Co., Ltd.'s Tokyo Branch changed on November 1, 2024. The former name was Tori Toho Kaikan Building; the new name is SCS ASAKUSABASHI 1-12-4. The branch now operates at the updated address.
Mitani Copper Co., Ltd. is recruiting full-time metalworking staff through Mynavi Tenshoku. Applicants with no experience and those seeking a second new-graduate position are welcome. Applicants must have graduated from high school or higher and be 35 or younger. See Mynavi Tenshoku for details on working hours, compensation, and benefits.
Mitani Copper Co., Ltd. has completely redesigned its website, revising the page structure and design to make it easier to use. The company plans to update information regularly and communicate more actively.