PS: To the best of my knowledge, The Boss never played a Getzen. Although he did play Elkhorn Holtons, and Elkhorn made him a superbone, which was pretty awesome.
Christine has an entire page devoted to Conn's valved trombones [from almost a century earlier]:
Conn Loyalist - Valve Trombone Model List
Conn even made a slide Cornet, which is possibly the single awesome-est concept that I've ever tried to ponder in the entire theory of Brasswinds.
Although I'd love to get my hands on a Sarrusophone.