YB/T 4971-2021
soft charcoal (English Version)

Standard No.

YB/T 4971-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

工业和信息化部

Latest

YB/T 4971-2021

YB/T 4971-2021 history

• 2021 YB/T 4971-2021 soft charcoal