21.   Other options include a battery-operated device that transmits a tiny electronic signal through the skin.

22.   Private investigator Todd Young hunched over a laptop computer in a darkened Toyota minivan, waiting for an electronic signal to lead him to a cellular phone bandit.

23.   Programs are encoded at the point of local transmission with an identifying electronic signal designating the intended audience level.

24.   Safety seminars, he notes, emphasize rescue procedures, such as electronic emergency signals and helicopter rescues, rather than individual responsibility.

25.   That division makes airplane navigation systems, radar systems, weapons control systems, and electronic signal jamming systems among other items.

26.   Such communications are harder to monitor than with the old-fashioned analog lines in which conversations are transmitted as electronic signals corresponding to audible sound waves.

27.   That noise can interfere with electronic signals, he said.

28.   The business makes underwater surveillance systems and electronic signal processing systems for military weapons.

29.   The chips produce an electronic signal that is proportional to the amount of light striking them.

30.   The electromagnetic spectrum is like an invisible layer cake in the atmosphere that can carry electronic signals.