They could not without Germans
true. but also germans could not create rockets without gun powder that was created by chines. also, first rockets in europe were brought from india. https://en.wikipedia.org/wiki/Mysorean_rockets
as you can see human knowledge is built on knowledge obtained from other people and other civilizations.
[–] 17588341? ago
Like what?
Pretty much all of these "uncountable overtures towards Poland" were nothing material for Poland. But then, maybe you know something that I don't. Let's see.
Maybe so, but the Polish nation did.