speaking-tube

speaking tube

noun
a tube for conveying the voice over a somewhat limited distance, as from one part of a building or ship to another.

Origin:
1825–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
speaking tube
 
n
a tube or pipe for conveying a person's voice from one room, area, or building to another

Collins English Dictionary - Complete & Unabridged 10th Edition
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