| 1946 |
Hirokatsu Nagao founded his own business as Nagao Shoten |
| 1949 | Hirokatsu Nagao was inaugurated as the president of Chodai Co. |
| 1950 |
Completed construction of new head office. |
| 1952 |
A weaving factory is completed in Omiya. |
| 1954 | Registered "C.D.K.SUPER TEX" as a trademark |
| 1956 | Renovation of weaving factory/New sample factory completed. |
| 1958 |
Registered "C.D.K.CHODAI TEX" as a trademark |
| 1959 | The dyeing plant in Skein was completed and started operation. |
| 1960 | Completed sample plant for distribution center and inspection plant.（Honkobe, Imaise-cho） |
| 1961 |
Reconstruction of Omiya Weaving Factory |
| 1966 |
Expansion of the second weaving factory. |
| 1967 |
Registered "H.S.K.HIGHLAND SUPER" as a trademark |
| 1968 |
The first cheese dyeing plant (Omiya) was completed. |
| 1969 |
Tokyo Sales Office opened in Awaji-cho, Kanda. Dyeing and Cheese Dyeing Plant No.2 (Omiya) completed. |
| 1970 |
New head office building (1-10-17 Sakae) completed. |
| 1973 |
Established Women's Clothing Department (Honkobe, Imaise-cho). |
| 1974 |
Application for registration of the trademark "SUPER TEX HIBRAIN". |
| 1979 |
Dyeing and high-pressure cheese drying machine installed. |
| 1982 |
Toyota Thruzer, Webbing Machine, HU Repier Room (Omiya Plant introduced QJ35 warbling machine) |
| 1985 |
Introduction of computerized color matching system (CCM) in dyeing laboratory. |
| 1986 |
Hirokatsu Nagao was inaugurated as Chairman and Daihachiro Nagao as President |
| 1988 |
Established a production control system using personal computers at the head office and factories. |
| 1989 |
Introduced a drawing machine manufactured by Zellweger Worcester of Switzerland (Omiya Plant). |
| 1991 |
Introduced off-line computer system to go online with five consolidation factories. |
| 1994 |
New building for Women's Clothing Department (Honkobe, Imaise-cho) completed. |
| 1997 |
Introduced Thruzer, Luce, Weaving Machine and G6200HU Repeater Room (Omiya Factory). |
| 2003 |
Introduced Thruzer, Luce, Weaving Machine and G6200HU Repeater Room (Omiya Factory). |
| 2004 |
Expansion of automatic dyeing liquid preparation machine and auxiliary kitchen (Omiya Plant) |
| 2012 |
Appointment of Daihachiro Nagao as Chairman and Masahiro Nagao as President |
