In a message dated 6/22/2009 10:02:06 A.M. Eastern Daylight Time, lherault at bu.edu writes: It's stamped 'J.H. ELLIS Melodious Music-Master' and has a patent date of 1916-1919. ----------------- This would be James H. Ellis - can u be more specific as to the patent dates on it? He worked on diaphragms. allen