A musical instrument playing actuator, includes an elastic diaphragm which has a through hole, wherein an annular projection portion is provided on the elastic diaphragm so as to project toward the diaphragm member, a diaphragm member which is arranged to oppose to the elastic diaphragm and is formed...http://www.google.fr/patents/US7683246?utm_source=gb-gplus-shareBrevet US7683246 - Musical instrument playing actuator, play assisting mouthpiece, brass instrument, automatic playing apparatus, and play assisting apparatus
Musical instrument playing actuator, play assisting mouthpiece, brass ...
