Originally Posted by verktyg

The first Shimano Titlist came out in 1971. It had that tab stop feature but those style Shimano derailleurs weren't readily available in the US market until ~1974 when Schwinn started using them and Shimano introduced the Crane model.



Campagnolo introduced the first generation Rally long arm derailleur which was pretty much a copy of Shimano's Crane design. Shimano hit them with patent infringement so they went away after several years. Campy replaced the original Rally with a kludged together mix of parts.