This picture of George Sutton of St. Paris, Ohio, taken near mid-day (as may be seen from the shadows on the ground) shows a vintage automobile with a 1932 license plate on the front bumper. Nobody has been able to account for the dark object seen over Sutton's left shoulder in this photograph.
Eugene Metcalf sworn affidavit from April 2, 1957. Jet plane swallowed from behind by large bell-shaped UFO, silver in color, through an opening. After this the UFO hovered and pulsated and churned up and down. Then it seemed to whirl and lift upwards. "While going through these gyrations, vapor came from porthole-like openings around the bottom part..."
David C. Knight. Polaroid photograph.
Bell shaped UFO with two white lights suspended over the top.
Gray metallic object hovering shaped like an upside down bell, without any doors or windows, and it about 6 meters in diameter.
Jarmo Nykanen. Photograph.
Alien Reproduction Vehicles (ARVs) description = bell-shaped.
Mark McCandlish, Brad Sorenson. Reversed-engineered UFOs made by studying actual ET craft built by Lockheed, Northrup, et al, and housed in secretive locations around the world. Also termed the flux liner.