2017UNE-EN 60153-1:2016/AC:2017-02:2017 Hollow metallic waveguides - Part 1: General requirements and measuring methods (Endorsed by Asociación Española de Normalización in March of 2017.)
2016UNE-EN 60153-1:2016 Hollow metallic waveguides - Part 1: General requirements and measuring methods (Endorsed by AENOR in October of 2016.)