ISO 9180:1988现行
Black leads for wood-cased pencils - Classification and diameters
出版：International Organization for Standardization
专家解读视频
SS ISO 9180 Ed. 1 (1996) - Identical
NF ISO 9180:1989 - Identical
DIN ISO 9180 (1989-04) - Identical
NEN ISO 9180:1990 - Identical
KS A ISO 9180:2014 - Identical
SANS 9180 Ed. 1 (2009) - Identical
KS A ISO 9180:2003 - Identical
UNI ISO 9180:1995 - Identical
BIS IS/ISO 9180:1988 (R2010) - Identical
