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speaking tube

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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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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speaking tube  
n.  A tube used to convey the voice over a short distance, as from one part of a ship to another.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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