| 984 / | HD | MUSICAL INSTRUMENTS |
| 300 | DD | ELECTRONIC MUSICAL INSTRUMENTS {structural combinations of microphones, pick-ups, or amplifiers with musical instruments subclasses 1+, 50+, and 100+; Instruments in which each note is generated by a different individually-actuated mechanical resonating structure and is amplified electrically subclasses 50+; Instruments in which each note is produced by a different electrically-vibrated sounding element subclasses 100+; Electronic circuits in general H03. {G10H} {4} |
| 301 | DD | .~ Details of electrophonic musical instruments {keyboards applicable also to other musical instruments subclasses 1+ and 50+} {G10H 1/00} {9} |
| 330 | DD | .~.~ Selecting circuits {G10H 1/18} {7} |
| 333 | DD | .~.~.~ Channel-assigning means for polyphonic instruments {G10H 1/18D} {3} |
| 334 | | .~.~.~.~ Associated with key multiplexing {G10H 1/18D2} {1} |
| 335 | DD | .~.~.~.~.~> Microprocessor-controlled keyboard and assigning means {G10H 1/18D2B} |