| Company name | Group | Parent | Subsidiary | Customer | Supplier | Alliance | Bank | Shareholder |
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| Yokohama Gas Service Center Co., Ltd. | ||||||||
| 神奈川合同アセチレン株式会社 |
Established Yokohama Acetylene Co., Ltd. at 1,400 Ichiba-cho, Tsurumi-ku, Yokohama-shi with capital of 1 million yen
Relocated headquarters and factory to current location, increased acetylene gas production capacity to 30 tons per month
Completed oxygen gas filling equipment and began manufacturing and sales of oxygen
Introduced liquid oxygen gas filling equipment, completed a large-scale oxygen gas filling plant with a monthly filling capacity of 400,000 m³, expanded headquarters office, built a new office, joint distribution office for special stores, special gas sales facility, welding material warehouse, and other facilities, and organized the comprehensive gas center
Opened Kashima sales office in the Kashima Seaside Industrial Complex, completed argon gas filling equipment at the headquarters factory, and began manufacturing and sales of argon gas
With diversification of products, the company name was changed to Yokohama Chemical Co., Ltd. The Fukushima Sales Office was established in Ōkuma Town, Sōtō District, Fukushima Prefecture, with an oxygen gas filling plant attached.
In response to the expanding demand for argon at the Fukushima Sales Office, an argon gas filling plant was completed.
Capital was increased to 70.95 million yen.
A high‑pressure gas container inspection facility was added to the headquarters plant, and a carbon dioxide filling facility was completed, beginning the manufacture and sale of CO₂.
A nitrogen gas filling facility was completed at the headquarters plant, starting the manufacture and sale of nitrogen gas.
A mixed gas filling facility was completed at the headquarters plant, starting the manufacture and sale of mixed gases.
The Kashiwazaki Sales Office was opened in Karuizawa Village, Karuizawa District, Niigata Prefecture.
A freon gas filling facility was completed at the headquarters plant, starting the manufacture and sale of freon.
Following the completion of nuclear power plant construction, the argon gas filling plant at the Fukushima Sales Office was discontinued and converted to a nitrogen gas filling plant.
In response to the cessation of specific freon manufacturing at the headquarters, the filling facility was changed to use alternative freon 134a.
The Shimokita Branch Office was opened in Rokugasho Village, Kamikita District, Aomori Prefecture.
The Kashima Sales Office built a new company building at 3‑99 Minami‑hama, Koshimizu Town, Kashima District, and relocated.
The Shimokita Branch Office was opened in Rokugasho Village as the Shimokita Sales Office due to business expansion.
Yokohama Acetylene Co., Ltd., established by a joint venture with Sagami Acetylene Co., Ltd. to consolidate acetylene production.
Yokohama Acetylene Co., Ltd. changed its name to Kanagawa Joint Acetylene Co., Ltd. following capital participation and business expansion with Tokai Sangyo Co., Ltd.
The headquarters plant introduced a fully automated container inspection system capable of inspecting high‑purity gas containers following the renewal of the inspection facility.
Yokohama Gas Service Center Co., Ltd. was established through joint capital participation with Japan Air Gas Co., Ltd. and Watarashokai Co., Ltd.
The Yokohama Gas Service Center Co., Ltd. comprehensive gas filling plant, equipped with the latest facilities, began operations on the headquarters grounds.
Due to the Great East Japan Earthquake, the Fukushima Sales Office was closed, and a temporary office was quickly opened in Iwaki City to resume business activities.
The Shimokita Sales Office was closed.
Fukushima Office: New office building constructed and relocated within the same Iwaki City as the temporary office
Headquarters: Vendor building completed and new sales company opened; simultaneously two gates and exterior walls renovated
Fukushima Office: New office building constructed in Futaba District where the damaged former office was located, and relocated again
Yokohama Chemical Co., Ltd. has redesigned its website to make product information and announcements easier to understand. SDS information has been added to the top page and individual product pages, and the site now features a responsive design for smartphones and tablets. We will continue working to provide more comprehensive information.