Defunct ride: Pippin, Kennywood Park. Built by John A. Miller in 1924. It was a ravine coaster. It originally opened with Dayton Fun House trains. In the winter of 1967-68, it was partially demolished, but the ravine part (bottom part) was rebuilt by Andy Vettel into the Thunderbolt.
Defunct ride: Little Dipper, Kennywood Park. It was originally built in 1948. It was a junior coaster designed and built by Andy Vettel. In 1950 it was redesigned and lengthened by 440 feet to give it a more "grown up" ride. It was taken out in 1984 (last season of operation) to make way for Raging Rapids.
Defunct ride: Jumbo Jets, Cedar Point. This Schwarztkopf (sp?) portable was purchased in 1970. It was located by the Space Spiral on the beach side. We believe it was gone by the 1980's but don't have an exact date.
If I can find out anything else, I will let you know.