The Mazzeo system is a key system for the clarinet invented by Rosario Mazzeo in the 1950s, and is a modification of the Boehm system. Exclusive mass-production rights were given to the Selmer company, although only 13,000 were made. Many are now in museums, but some are in private collections or can be found for sale. Selmer's "Bundy" line of Resonite student instruments included a Mazzeo model.
The differences between a Boehm system clarinet and a Mazzeo system clarinet are
Full and modified Mazzeo clarinets feature