Nope. There where several "assault rifles" designed and built long before the StGew44 or the AK47 showed up.
The Italians even adopted one in the 1890s. But because Italian industry wasn't, let's just say not very capable at the time, only small numbers were produced. Even the Browning BAR, adopted in 1918, predates it and lasted far longer in service around the world.
If there is one thing the Germans did give to the world was the Reinheitsgebot in 1516. Because beer should only be made from water, barley, and hops. For that alone, they stand tallest in history.
It really is true what they say. Post something wrong, and soon enough someone will correct you. Maybe you could even think of this as a clever way of crafting an effective question.
The underlying point of my answer is that there is very little new under the sun. Most everything we "enjoy" today, is merely an extension and improvement of an idea that someone had earlier. From assault rifles to television to space flight. We merely extend the path of those that walked it before.
I never have thought that the trope "If you want an answer to a question, post something wrong" was a good method. If you have a question about something, ask the question. The problem is, most people ask their questions in the wrong place. Don't ask a question about fixing your car in a hair salon. And don't ask about hair cuts in a mechanic shop.