Steve Bellovin@inthehands @mattblaze and I have talked about some complex mechanical things that we no longer do: railroad interlockings, lever voting machines, the cell door locks at Alcatraz, and doubtless many more I don’t know about. (Railroad interlockings make sure that signals and switch tracks only change state in a safe order. For example, a signal must be turned to STOP before a switch is lined against oncoming traffic.)
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