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speech scramblers
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View A guide to voice scramblers for law enforcement agencies By Robert Edward Nelson
A guide to voice scramblers for law enforcement agencies
A guide to voice scramblers for law enforcement agencies
By Robert Edward Nelson
View Speech and facsimile scrambling and decoding By United States. Office of Scientific Research and Development. National Defense Research Committee 
Speech and facsimile scrambling and decoding
By United States. Office of Scientific Research and Development. National Defense Research Committee