bn:00894431n
Noun Concept
Categories: Covert listening devices, Surveillance, Counter-intelligence, Espionage, Espionage techniques
EN
countersurveillance  Bug-sweeper  Bug-sweepers  bug-sweeping  Bug sweep
EN
Countersurveillance refers to measures that are usually undertaken by the public to prevent surveillance, including covert surveillance. Wikipedia
Definitions
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