Dear Mike Knudsen,  "The" specialist for piano melodico (instruments
and documentation) is Franco Severi, in Italy, a very nice and
knowledgeable man.  His e-mail is <fseveri@mbox.queen.it>.  He is
very often traveling outside Italy, so possibly he will not answer
you before a few weeks.

Best regards,

Philippe Rouille  (Paris, France)
rouille@cnam.fr
http://www.cnam.fr/museum/musica_mecanica/