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Closed-circuit television - Wikipedia
Tavcom Training - Did you know CCTV was first documented in Germany during WW2 to monitor German rocket launches? This afternoon we're sharing some # cctv Friday facts with you as we take
When Were Security Cameras Invented? CCTV History | SafeWise.com
Evolution of CCTV Technology - Get CCTV Security and Surveillance Cameras from 2MCCTV