Try the Internet Pinball Database:

http://www.ipdb.org/machine.cgi?id=1254

Humpty Dumpty added player-controlled flippers (which was a breakthrough in itself) but if you look at the images you'll see that the placement was awkward and hard to map between the buttons you were touching and the motions that the flippers made.

Triple Action put them on the bottom and swung them like bats - something that felt more natural and enjoyable.