A music teaching instrument adapted to teach a player the notes of a musical scale so that the notes will be remembered. The instrument includes a sound system having a memory in which is stored audible tones of the musical scale, and means to reproduce a tone extracted from the memory so that it can...http://www.google.fr/patents/US20010039869?utm_source=gb-gplus-shareBrevet US20010039869 - Music teaching instrument
Numéro de demande: 09/731,408 Numéro de publication: US 2001/0039869 A1 Date de dépôt: 6 déc. 2000 Brevet délivré: US6337434 ( Date de délivrance 8 janv. 2002)
