DIN EN 61753-111-9:2010 光纤互连器件和无源元件性能标准.第111-9部分:地下类S闭包(IEC 61753-111-9-2009).德文版本EN 61753-111-9-2010
Fibre optic interconnecting devices and passive components performance standard - Part 111-9: Sealed closures for category S - Subterranean (IEC 61753-111-9:2009); German version EN 61753-111-9:2010