In the late 1990’s, Ingenuity Sports of Altadena, California, bought a number of small, high end, US bicycle component companies, starting with Mantis in 1995, and including Critical Racing and Carmichael. At some point the second Joe’s design, or possibly the whole Prototype Machining company, was acquired by Ingenuity Sports and the derailleur was possibly rebranded as Carmichael. This derailleur may also sometimes be branded as Rhino (or the Rhino may be slightly beefier Joe’s model following a similar design).