DIN EN IEC 61753-111-9 E:2021-10 Fibre optic interconnecting devices and passive components performance standard - Part 111-9: Sealed closures for category S - Subterranean
1970DIN EN IEC 61753-111-9 E:2021-10 Fibre optic interconnecting devices and passive components performance standard - Part 111-9: Sealed closures for category S - Subterranean