
Stainless steel butt-welding fittings
出版:International Organization for Standardization

专家解读视频
NFA 49 285:1982 - Similar
NFA 49 296:1983 - Similar
NFA 49 289:1990 - Similar
UNI ISO 5251:1982 - Identical
KS B ISO 5251:2003 - Identical
KS B ISO 5251:2013 - Identical