Ambient air - Standard method for measurement of NO₃⁻, SO₄²⁻, Cl⁻, NH₄⁺, Na⁺, K⁺, Mg²⁺, Ca²⁺ in PM2,5 as deposited on filters; German version EN 16913:2017
Edition 2017-09

Electrical engineering; basic environmental testing procedures; guidance to test Kc: sulphur dioxide SO₂ (high concentration) for electrical contacts and connections; indentical with IEC 68-2-49, edition 1983
Edition 1985-08

Link Layer Assisted Service Options for Voice-over-IP: Header Removal (SO 60) and Robust Header Compression (SO 61)
Edition 2003-05

Private Integrated Services Network (PISN) - Mapping functions for the employment of 64 kbit/s circuit mode connections with 16 kbit/s sub-multiplexing (ISO/IEC 17310 (2002), modified) (Endorsement of the English version EN 301039 V 1.2.1 (2002-09) as German standard)
Edition 2003-12

Ambient air - Standard method for measurement of NO₃⁻, SO₄²⁻, Cl⁻, NH₄⁺, Na⁺, K⁺, Mg²⁺, Ca²⁺ in PM2,5 as deposited on filters
Edition 2017-10

PUBLIC SWITCHED TELEPHONE NETWORK (PSTN). METHOD OF RATING TERMINAL EQUIPMENT SO THAT IT CAN BE CONNECTED IN SERIES AND/OR IN PARALLEL TO A NETWORK TERMINATION POINT (NTP).
Edition 1999-12-31

Ambient air - Standard method for measurement of NO₃⁻, SO₄²⁻, Cl⁻, NH₄⁺, Na⁺, K⁺, Mg²⁺, Ca²⁺ in PM2,5 as deposited on filters
Edition 2018-02-28