Edison
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Edison was apparently quite successful, to the point where some languages other than English have a word that sounds like "hello" (for example, Russian "allo") which is used only when answering the phone.
French as well I think
Yeah there's a whole TV show about that from the 80s.
That makes sense cause in Brazil we say "alô" when answering the phone, a word that only seems to exist for this single purpose.
In Thailand, they use the the German hallo (hello).
In Finnish we also say "haloo"