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LittleMetalHorse t1_iucn5qu wrote

Reply to comment by wizard2278 in ELI5: Morse code is made up of dots and dashes. How did telegraph operators keep from losing track of where one letter ended and another began? by copperdomebodhi

Used in IR signal flashes in my personal experience, very useful low tech IFF.

Also, as a pilot in East UK where there are (were?) Lots of airfields, a flashing ident beacon you could see from 10k out made it easier not to land at the wrong runway...

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