This would be kind of a pain, but could you start off a new turn by trying a to make tech trades with the AI? Not for keeps, but just to see what's out there. Then you could compare the lists of "available techs" from each civ and if two or more have techs that you don't, voila.
Oh - Egypt discovered "Naue Type 2 Sword" last turn. If you don't have it and anyone else does, there's one.
Oh - Egypt discovered "Naue Type 2 Sword" last turn. If you don't have it and anyone else does, there's one.
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