A guide to voice scramblers for law enforcement agencies /
Robert E. Nelson ; prepared by the Law Enforcement Standards Laboratory, Center for Consumer Product Technology, National Bureau of Standards, for the National Institute of Law Enforcement and Criminal Justice, Law Enforcement Assistance Administration, Department of Justice.
|Main Author:||Nelson, Robert Edward, 1931-|
Washington : U.S. Dept. of Commerce, National Bureau of Standards : 1976.
Police communication systems
Police communication systems /
34 p. :
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