# tunnelling shield

> protective structure used during the excavation of tunnels

**Wikidata**: [Q2016868](https://www.wikidata.org/wiki/Q2016868)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Tunnelling_shield)  
**Source**: https://4ort.xyz/entity/tunnelling-shield


## References

1. Integrated Authority File
2. National Library of Israel Names and Subjects Authority File