speaking tube
Concise Oxford English Dictionary © 2008 Oxford University Press:
speaking tube
▶noun a pipe for conveying a person's voice from one room or building to another.
'speaking tube' also found in these Oxford entries:
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speaking tubeConcise Oxford English Dictionary © 2008 Oxford University Press: speaking tube ▶noun a pipe for conveying a person's voice from one room or building to another. 'speaking tube' also found in these Oxford entries:
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