DIN EN 17527
Helium cryostats - Protection against excessive pressure; German and English version prEN 17527:2020
现行
发布日期 :
2001-07-01
实施日期 :
ITU-T K.46
Protection of telecommunication lines using metallic symmetric conductors against lightning-induced surges
现行
发布日期 :
2013-04-01
实施日期 :