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It's pretty clear that DaVincni's journals could not have been deciphered nor his inventions built practically in his time but how much later could they have been built and used?

A modified and successful version of his flying machine, the automobile, the tank, etc.

Is it possible for these things to come about by the mid-late 18th century resulting in DaVincian technology emerging in use and popularity by the Napoleonic Wars or even the American Revolution?

If so, what are the effects?
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