# HNLMS O 20

> 1939 O 19-class submarine

**Wikidata**: [Q2557417](https://www.wikidata.org/wiki/Q2557417)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/HNLMS_O_20)  
**Source**: https://4ort.xyz/entity/hnlms-o-20