Frispel
sedan 2001
Zipper Flipper —A trademarked feature found on some Bally games that (temporarily) closed (or "zipped" up) the gap between the lowest flippers when certain game goals were accomplished, such as lighting up a series of targets, thereby preventing the ball in play from draining down the center drain. Bally parts catalogs refered to this feature as the Flipper-Zipper Assembly.Also used on some Williams games, where it was known as "Closing Flipper Action".