Vibratube
The American Earphone Company in New York manufactured this
Vibratube.
This model is a rubber tube covered in black fabric ($5.00). They
apparently also made a spiral metal tube model for $7.00.
This conversation tube dates from somewhere around 1920.
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The tube is 36 inches long with a hard rubber bell and ear piece,
both of which are detachable.
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The Vibratube assembled and mostly unrolled to show its length.
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The attached tag states "The mouth piece
should touch the lips of speaker for best results."
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