BEEPER_FOR_TELEPHONE_RECORDING

Published:2009/7/20 1:49:00 Author:Jessie | From:SeekIC

Generates periodic 1,400-cps tone or beep having 0.2 sec duration, at intervals of about 15 sec, as required by Federal law when recording or broadcasting telephone conversations.-J. Zelle, Phone Calls for Broad-cast, Electronics, 31:45, p 96-101.



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