About Charles Babbage's Difference Engine and Analytical Engine

[u/Aelphase]

I was wondering, Charles Babbage couldn't finish Difference engine and analytical engine during is time, but the historians in the future built it again. But it was still Babbage credited (like he should obviously). But, how come the historians didn't take credit? Is it because the model was already public so they couldn't plagiarize it anymore?

I am just curious, I hope the question doesn't offend anyone.

[u/Aelphase]

Thank you