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 Date: 2013-02-17 12:34:48Cryptography Secure communication SIGSALY Secure voice Homer Dudley Secure telephone Vocoder Bell Labs Pulse-code modulation Technology Telephony Electronic engineering |
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| First Page | Document Content | |
|---|---|---|
Date: 2013-02-17 12:34:48Cryptography Secure communication SIGSALY Secure voice Homer Dudley Secure telephone Vocoder Bell Labs Pulse-code modulation Technology Telephony Electronic engineering |
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Telephone Secrecy Melville Klein