Digital data transmission tests on voice channels /
by Urban Sciences, inc. ; prepared by Law Enforcement Standards Laboratory, Center for Consumer Product Technology, National Bureau of Standards ; prepared for National Institute of Law Enforcement and Criminal Justice, Law Enforcement Assistance Administration, U.S. Department of Justice.
|Corporate Author:||Urban Sciences, Inc.|
Washington, D.C. : Dept. of Commerce, National Bureau of Standards : 1977.
Data transmission systems.
Police communication systems.
v, 59 p. :
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||University of California|