QCHORD by SUZUKI MUSICAL INSTRUMENTS CORPORATION (Track this)
Intl: (015) Musical Instruments US: 002; 021; 036 Filing date: 25-Nov-1998 Serial number: 75595083
LYRACHORD by GEWA MUSIC GMBH (Track this)
Intl: (015) Musical Instruments US: 036 Filing date: 24-Aug-1967 Serial number: 72278970