# speaking tube

> air pipe through which speech can be transmitted over an extended distance

**Wikidata**: [Q1319005](https://www.wikidata.org/wiki/Q1319005)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Speaking_tube)  
**Source**: https://4ort.xyz/entity/speaking-tube


## References

1. Freebase Data Dumps. 2013