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a system that warns you by beeping in your pocket when it is called (for example through very low frequency pulses that are superimosed on the emission of stations emitting in the LW band –such a station can cover very large areas– but the band width is very limited), and then displays a message on a small screen.
This is what I think it's about.
own and partial knowledge in that matter
Yves Georges France Local time: 12:02 Native speaker of: French PRO pts in pair: 185