I wonder if anyone can throw any light on three old cameras I have been given. They are all 120 roll film cameras. The first is a folding camera and the only name on it is 'Ajax'. By the general look of it, I assume it is of late 1920s-1930s vintage. The second is a box camera with the name 'Gevabox' printed on the lower part of the lens housing. This looks more like a 1940s model. The final one is a 'Gugo'. To use this camera, you first have to extend the lens and then rotate it to lock it in position. Until it is locked, the shutter release mechanism is not connected. Thanks, Mark.