Security and surveillance instruments for use in the fields of security, contraband and counter-terrorist searching, namely, general purpose metal detectors, high sensitivity metal detectors, dual purpose metal detectors, portable explosives detectors, contraband detectors, namely, detectors that indicate the presence of hidden materials by signaling unexpected changes in the density or thickness of a surface through the release of gamma rays; optical apparatus and instruments for use in the ...

Security and surveillance instruments for use in the fields of security, contraband and counter-terrorist searching, namely, general purpose metal detectors, high sensitivity metal detectors, dual purpose metal detectors, portable explosives detectors, contraband detectors, namely, detectors that indicate the presence of hidden materials by signaling unexpected changes in the density or thickness of a surface through the release of gamma rays; optical apparatus and instruments for use in the ...