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
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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.
6% of the market sufficed to find such exclusive dealing unlawful under section 5 of the FTC Act); Dictograph Prod.
Tatta studied civil engineering at City College of New York before entering the job market in 1943 as an installer at Dictograph, an interoffice communications equipment company, where he worked for 23 years in positions of increasing responsibility.