| 1937(S12)Mar | Establish TOHO ZINC INDUSTORY CO.,LTD. |
|---|---|
| 1946(S21)Nov | Change the company's name to TOHO INDUSTORY CO.,LTD. |
| 1964(S39)Aug | Change the company's name to TOHO SHEET & FRAME CO.,LTD. |
| 1968(S43)Dec | Establish YACHIYO Factory in KAMIKOYA industrial park /YACHIYO CHIBA |
| 1970(S45)May | Close TOKYO 1st factory Relocation of YACHIYO factory |
| 1984(S59)Jun | The introduction of Corporate identity Over 50 activities |
| 1989(H1)Nov | Establish new urban-type factory in KOMATSUGAWA,EDOGAWA,TOKYO |
| 1998(H10)Dec | Open YACHIYO business office Relocation of head office functions |
| 2003(H15)Apr | Start to production and distribution of window for rail vehicle "I.G.P®"（porycarbonate-glass hybrid window) |
| 2008(H20)Oct | Receive good design award(GDA) for"I.G.P®"（porycarbonate-glass hybrid window） |
| 2009(H21)Nov | Receive good design award(GDA) for"Clearheat P"（porycarbonate-plastic window） |
| 2011(H23)Jun | Receive ISO14001 for business actvity in manufacturing of galvanized sheet,color sheet,metal siding,metal roof,metal drum,metal pallet,window for rail vehicle |
| 2013(H25)Oct | Receive good design award(GDA) for"cover for railroad signal/cover for clearheat signal |
| 2018(H30)Apr | First order overseas of "I.G.P® "(porycarbonate-glass hybrid window) |
| 2020(R2)May | Receive ISO9001 for design,development and manufacturing of resin products for rail vehicle |