Definitions for bi-telephone
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The Standard Electrical Dictionary
Bi-telephone
A pair of telephones arranged with a curved connecting arm or spring, so that they can be simultaneously applied to both ears. They are self-retaining, staying in position without the use of the hands.
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"bi-telephone." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/bi-telephone>.

