1921Toshihide Takazuma founds Miya Steelworks 1926Tokyo Shearing Co., Ltd. established 1930Teikoku Hatsujo Seisakusho launches trial production of automotive wheels 1934Tadao Nonagase establishes Tokyo Sharin Seisakusho C......1921Toshihide Takazuma founds Miya Steelworks 1926Tokyo Shearing Co., Ltd. established 1930Teikoku Hatsujo Seisakusho launches trial production of automotive wheels 1934Tadao Nonagase establishes Tokyo Sharin Seisakusho Co., Ltd. 1941Tokyo Sharin Seisakusho merges with Abe Tekkosho Co., Ltd. to form Sharin Kogyo Co., Ltd. 1943Miya Steelworks Co., Ltd. merges with Toyo Shearing Co., Ltd. to form Toto Seiko Co., Ltd. 1955Toto Zoki Co., Ltd. established (combining Toto Seikos Shinagawa Seisakusho with Takahama Seisakusho Co., Ltd. 1956Toto Tekko Co., Ltd. established 1958Toto Steel completes Toyohashi steelworks (now Toyohashi Factory) 1961Toto Zoki builds Chigasaki plant (now Kanagawa Factory) Sharin Kogyo completes Toyokawa plant (now Toyokawa Factory) 1964Sharin Kogyo completes Ayase plant (now Ayase Factory) Sharin Kogyo, Toto Steel, Toto Zoki, and Toto Tekko merge to form Topy Industries Inc. 1965Toyohashi Factory completes bridge plant 1972Technical development center created at Toyohashi Plant 1973Kanuma Factory completed 1976Toyokawa Factory completes cast aluminum wheel plant 1982Topy develops wheels for super-large construction vehicles (SGORs) and large/mid-size tubeless wheels for trucks and buses 1985Toyohashi Factory introduces first 120-ton electric furnace in Japan to use bottom tapping method 1988Toyohashi Factory modifies a 30-ton electric furnace into Japans first direct current (DC) furnace 1989Toyohashi Factory completes machinery plant 1990HSST drive tests begin at Toyohashi Factory 1995Toyohashi Factory completes steel bar plant 1998All production facilities obtain ISO9001 international quality assurance certification 1999All production facilities obtain ISO4001 international environmental management certification