Cellular phone usage detection system comprising a camera and a mobile phone signal receiving device

Measuring, test and electronic control devices and instruments and systems consisting of such equipment; components of the aforementioned items, in particular measuring amplifiers, power amplifiers, processors, in particular communication processors, power stage modules, compensators, taring devices, phase adjustment devices, zero setting modules, arithmetic devices, filter modules, frequency counters, calibration devices, analog-digital converters, limit monitors, peak detectors, memories, l...

communications by fiber optic networks; transmission and receiving quantum cryptographic keys by fiber optic network