Telegraphy Applied to TDS Speech Secrecy System Open PDF Document Details Document Type Technical Report Publication Date Oct 31, 1942 Accession Number ADA800129 Entities People C. W. Carter Tags Communities of Interest Advanced Electronics Human Systems DTIC Thesaurus Topics Background Noise Communication Systems Commutators Contracts Engineering Engineers Frequency Intervals Inversion Magnetic Tape Materials Measurement National Security New York Telegraph Signals Teletypewriters Time Intervals