Nazi-UFO evidence? "Flying saucers, a German invention" according to newspaper headlines.

Here is a collection of headlines from German newspapers from the 50s and beyond:

The headlines say:
 
“Flying saucer invented in Germany”.

“Flying saucers, a German invention”.

“The first "flying saucer" flew in 1945 in Prague”.

“"Saucers" disclosed”.

“We constructed flying discs”.

“Flying saucers = V7 says German designer”.

“Flying Saucer = German craft”.

“Adolf Hitler's little green men”.       

Again, how can this be in the public domain, and then just disappear?