# Recommendation S.9 (11/1988): Switching equipment of start-stop apparatus

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051450](https://www.wikidata.org/wiki/Q27051450)  
**Source**: https://4ort.xyz/entity/recommendation-s-9-11-1988-switching-equipment-of-start-stop-apparatus