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It can be a kind of gray area.

Leonardo da Vinci had the idea of a human powered flying machine. I pretty sure nobody would say that his sketches are an invention. On a second thought, there are so many people around, probably somebody would claim it.

http://www.flyingmachines.org/davi.html

The South Hampton University eventually made it happen centuries later in 1961.

https://en.m.wikipedia.org/wiki/SUMPAC

Did they invent it or "just" built it? Probably they could patent parts of the final airplane. I didn't check if they did.




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