Dictograph

Dictograph

(ˈdɪktəˌɡrɑːf; -ˌɡræf)
n
(Telecommunications) trademark a telephonic instrument for secretly monitoring or recording conversations by means of a small, sensitive, and often concealed microphone
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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He made a lot of money as chairman of the Dictograph Products Company and president of Packard Razor, his own company.
In the next room were "[t]wo stenographers who would be able to hear conversations in the other rooms by listening to a dictograph machine--a new and potentially frightening technological innovation....
1962) (finding that foreclosure of 8.6% of the market sufficed to find such exclusive dealing unlawful under section 5 of the FTC Act); Dictograph Prod.