Quote Originally Posted by DaveO View Post
One thing you can do with the Rolleiflex when you go to a parade or are in a crowd, is hold it over your head and look up into the finder and take a picture. You can't do that with the Hassy. I believe it was designed to do this so that in trench warfare in WWI you would only expose your arms to take a picture instead of your upper body.

DaveO
"Rollei is a German manufacturer of optical goods founded in 1920 by Paul Franke and Reinhold Heidecke in Braunschweig, Lower Saxony..."
"...1928 saw the production of the first ten prototypes of the legendary twin-lens Rolleiflex..."

"...World War I was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918..."

Maybe another manufacturer was using the periscope idea during the Great War?