ISO 9177-3:1994現行
Mechanical pencils Part 3: Black leads - Bending strengths of HB leads
出版：International Organization for Standardization
專家解讀視頻
KS G ISO 9177-3:2002 - Identical
KS A ISO 9177-3:2007 - Identical
KS G ISO 9177-3:2014 - Identical
NEN ISO 9177-3:1994 - Identical
DIN ISO 9177-3 (1995-01) - Identical
NF ISO 9177-3:1994 - Identical
BIS IS/ISO 9177-3:1994 (R2010) - Identical
SS ISO 9177-3 Ed. 1 (1996) - Identical
