Amphibious bicycle that is able to be ridden on land as well as water. Maximum weight on water was 120kg. (France, 1932)
A piano for bedridden people. (England, 1935)
A shield to protect the face during snow storms and blizzards. (Canada, 1939)
A revolver that captures an image right before the trigger is pressed. (USA, 1938)
A device that would teach a child how to walk. (Switzerland, 1939)
