History
| 1994 | Apr. | Established private company SEAMATE in Kounan-cho, Naka-ku, Hiroshima city with capital of 3 million JPY. |
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| 1995 | Mar. | Relocated office to Ohte-machi, Naka-ku, Hiroshima city. |
| Sep. | Opened Shanghai Office. | |
| 1996 | Jun. | Obtained orders for Steel Door from 8 member companies of Chugoku District Shipbuilding Association. |
| Aug. | Reorganized into joint-stock corporation. Stated capital 10 million JPY. | |
| Oct. | Delivered NK classed main air reservoir first made in China for the first vessel of Tsuneishi (Cebu). | |
| Dec. | Increased capital to 17 million JPY. | |
| 1997 | Mar. | Accepted sole agency of Huangshan Marine Fitting Factory. |
| Oct. | Delivered anchor chain of Jingjiang Anchor Chain Factory to Tsuneishi (Cebu). | |
| 1999 | Feb. | Relocated head office to 1-4-20, Nakahirocho, Nishi-ku, Hiroshima city. |
| Dec. | Made an agreement for sole agency with Jiangsu Asian Star Anchor Chain Co., Ltd. | |
| 2000 | Feb. | Established Nantong Showa Machinery Co., Ltd. in Nantong city, China. |
| 2003 | Jul. | Developed and started shipment of electrostatic capacity type Water Ingress Alarm System. |
| Jul. | Established joint company OST in Hai-phong, Vietnam. ※dissolved the capital tie-up in March, 2013 |
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| 2004 | Jan. | Obtained type approval for electrostatic capacity type Water Ingress Alarm System from major classification societies. |
| 2005 | Jan. | Obtained MED CE mark for Immersion Suit. |
| 2006 | Jan. | Started sale of Cargo Hold Inspection Ladder. |
| 2008 | Apr. | Moved to new-built head office in 1-20-16, Nakahirocho, Nishi-ku, Hiroshima city. |
| 2010 | Feb. | Started overseas deployment of maintenance service for inflatable liferaft together with Ship Guard Inc. |
| 2012 | Apr. | Developed and started distribution of BNWAS for existing vessels. |
| Aug. | Took out ISO9001 certification from DNV GL. | |
| Oct. | Developed and started distribution of Hydrostatic Release Unit for liferaft etc. | |
| 2013 | Jan. | Took out MED certification for Water Ingress Alarm System and BNWAS. |
| Apr. | Was affiliated with Kashiwa Co., Ltd. by M&A. | |
| 2015 | Oct. | Developed and started selling explosion-proof transceiver for firefighter appliances. |
| 2020 | Mar. | Our anchors and chains have received overseas materials quality inspection certification from the Specialists Center of Port and Airport Engineering (SCOPE). |
| Nov. | First delivery of anchor chains and anchors for floating reef fishing. | |
| 2024 | Apr. | Start of sales of hydrostatic release units (HRU) and weak links approved by the Ministry of Land, Infrastructure, Transport and Tourism. |