At one point, all of Germany's air traffic control message routing was in Emacs!
https://old.reddit.com/r/emacs/comments/lly7po/do_you_use_emacs_lisp_as_a_general_purpose/gnvzisy/
@wilfredh Britain's service for assigning phone numbers was severely disrupted because it was all done via Yahoo Groups
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@wilfredh Britain's service for assigning phone numbers was severely disrupted because it was all done via Yahoo Groups