blue box
noun
an electronic device used by phone phreaks to send out signals that unlock long-distance telephone circuits.
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Origin of blue box
First recorded in 1975–80
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
blue box
noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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