51.   When tapped, the sensors send an electronic signal to the drum simulator.

52.   Within an hour, the robot had zeroed in on electronic signals that are being emitted from each of the two boxes.

53.   An electronic signal was sent from the device to a central computer that counted the votes.

54.   Another Iraqi spokesman, quoted by the official Iraqi News Agency, said no air defense units in the area sent electronic signals at the time.

55.   But another Iraqi spokesman, quoted by the official Iraqi News Agency, said no air defense units in the area sent electronic signals at the time.

56.   Green dots are a result of electronic signals, called IFF, which identify whether an aircraft is friend or foe.

57.   He said the kill vehicle did not separate from the booster because it did not receive the necessary electronic signal.

58.   Instead of dropping bombs, the jets would fire an electronic signal monitored by radar.

59.   It is used to detect, identify and precisely locate potentially hostile sources of communications, radars and other electronic signals.

60.   It uses an array of sensitive devices to collect electronic signals from military communications and radars, enabling the Pentagon to monitor Chinese military activities.