We were reminded of the incredible goodness of the three-stage sequential turn signals used by late-60s/early-70s Mercury Cougars after seeing the '73 Cougar DOTS car a week ago, so a little digging on the Tube That Is You and voila! The mechanism behind the magic was actually a failure-prone motor-driven mechanical device, apparently derived from pinball-machine technology, but the many-moving-parts analog beauty of it all just makes this feature that much cooler.