# acoustic mirror

> technology for detecting incoming enemy aircraft, used before radar was developed

**Wikidata**: [Q444789](https://www.wikidata.org/wiki/Q444789)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Acoustic_mirror)  
**Source**: https://4ort.xyz/entity/acoustic-mirror


## References

1. Freebase Data Dumps. 2013
2. BabelNet