ISO 6621-4:2003被替代
Internal combustion engines - Piston rings Part 4: General specifications
出版：International Organization for Standardization
专家解读视频
SS ISO 6621-4 Ed. 2 (2007) - Identical
BS 5341-6.4:1992 - Equivalent
BS ISO 6621-4:2003 - Identical
GB/T 1149.1-2008 - Identical
DIN ISO 6621-4 (1990-06) - Identical
NF ISO 6621-4:1989 - Identical
UNE 26417-4:1994 - Identical
DIN 70909 (1987-02) - Similar
SS ISO 6621-4 Ed. 1 (1991) - Identical
UNI ISO 6621-4:1992 - Identical
KS R ISO 6621-4:2009 - Identical
