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A fun example of that, there's been time and again where prototypes of things we now think of as modern were made thousands of years before. But they didn't have the prerequisite tools and information to make it anything more than a prototype.
Like "Hero's Engine", a thousand of years old toy that's a fully working Bronze Steam Engine. But cause they weren't good enough at metallurgy yet, they knew it could work bigger but didn't have any methods to make it bigger (copper and bronze can't handle the strain that anything bigger than a fist would make)