https://digilab.ptb.de/oiml-g-18/vocab/ OIML G18 Controlled Vocabulary Julia Neumann Julia Neumann 2022-12-16 en-EN 2022-12-19 09:13:31 electronic gas meter #01975 2022-12-19 09:13:31 https://digilab.ptb.de/oiml-g-18/vocab/skos/2