1960 Yamamoto Hatsujo Bunki, Inc. (founded in 1908) and Nitto Industries, Inc. were merged together, and Sumikin Hatsujo Co., Ltd. was formed as an affiliate of Sumitomo Metal Industries, Ltd. Headquarters in Amagasaki, C......1960 Yamamoto Hatsujo Bunki, Inc. (founded in 1908) and Nitto Industries, Inc. were merged together, and Sumikin Hatsujo Co., Ltd. was formed as an affiliate of Sumitomo Metal Industries, Ltd. Headquarters in Amagasaki, Capital: yen 190 million 1965 Headquarters moved to Fujisawa Acquired Nitto Industries, Inc. and Amagasaki Factory was opened. Capital: yen 200 million 1970 Factories were united in Fujisawa Factory. Capital: yen 300 million 1975 NHK Spring Co., Ltd. acquired shares from Sumitomo Metal Industries, Ltd. and company name was changed to Sumihatsu Co., Ltd. 1978 Acquired Nikken Spring, Inc., an affiliate of NHK Spring Co., Ltd. Capital: yen 345 million A new factory for spring clips was completed in the corner of in the Industrial Complex at Yamato-mura, Ibaraki. 1980 ---1981 Manufacturing of coil spring, turnout and leaf spring were moved to Tsukuba one by one. 1981 Fujisawa Factory was closed, and Tsukuba Factory started. 1982 Production line for automobile coil spring was commissioned. 1983 Headquarters moved to Yasuda Seimei Bldg., Iwamotocho, Tokyo. 1988 Strail (Noiseless railroad crossing system) was released. 1990 Installed a machining center for rail processing. 1992 Private power station was commissioned. 1995 Sumihatsu Services, Inc. was founded as an affiliate. 1997 Manufacturing of Balancer Assy was started. Business cooperation agreement was signed with Pandrol. 1998 Commercial production of Pandrol started. 1999 ISO 9001 (Leaf spring, Coil spring for automobiles) was certified. 2000 ISO 9001 (Industrial components, Special parts, and Turnout) was certified. Sumihatsu Services, Inc. started elderly care business. 2001 Production of synthetic sleeper started. 2002 Closed manufacturing of coil spring for automobiles. 2003 Received order for rail fastening device and turnouts for Taiwan Shinkansen. All of shares owned by Sumitomo Metals (Kokura), Ltd. was transferred to NHK Spring Co., Ltd. ISO 14001 was certified.