
Hexagonal dienuts
出版:International Organization for Standardization

专家解读视频
PN 93/M-58166:1993 - Identical
NFE 66 156:1985 - Identical
BS 1127-5:1990 - Equivalent
DIN 382 (1987-12) - Identical
NBR ISO 7226:2001 - Identical
GB/T 20325-2006 - Modified
BS 1127:1974 - Similar
NBR ISO 7226:2011 - Identical