tk works is a trademark of Toyo Kohan.
Those subjected to electro-galvanized to SPCC of the original plate, te-90 is a
SECC equivalent.
We are using this as SECC.
Specification of TE-90 is the only Japanese.
I will send what you an excerpt, plus the English translation to it.
翻訳されて、しばらくお待ちください..
