21 VOICE CIPHERING DEVICES FOR SPEECH TRANSMISSION APPARATUS, INCLUDING RADIO TRANSMITTERS, RADIO RECEIVERS, AMPLIFIERS, MICROPHONES, LOUDSPEAKERS, PARTICULARLY USEFUL FOR TRANSMISSION IN SECRECY OF DATA
Trademark Events
May 20, 1996
Expired Sec. 9
Nov 18, 1981
Registered - Sec. 8 (6-Yr) Accepted & Sec. 15 Ack.