Folding Corona - as simple as closing a book

(Full-page advertisement from the February 1920 issue of Popular Science, page 153.)

Or is it.

It's intuitive and folding over works. Just like closing a book. Unlike a book however, the Corona should ideally have its carriage locked in the correct position and its shift locked.

The many images of folded Corona 3 typewriters, both online and in print, suggest that often the shift is not locked - and the rear folding-beams pop back up.

When the shift is locked however, the Corona 3 typewriter folds very neatly flat.

The locks also reduce strain on the machine when it's in the carrying-case. 

Folding Corona - almost as simple as closing a book ;-)