| 984 / | HD | MUSICAL INSTRUMENTS |
| 1 | DD | ORGANS; HARMONIUMS {mouth organs or accordions subclasses 100+; Aspects of automatic actuation subclasses 200+; Combinations of microphones, pick-ups or amplifiers with musical instruments, electric organs subclasses 300+} {G10B} {2} |
| 2 | DD | .~ General design of organs, harmoniums, or like wind-actuated musical instruments {G10B 1/00} {2} |
| 3 | | .~.~ Of organs {G10B 1/02} {2} |
| 4 | DD | .~.~.~> Electrically operated {G10B 1/04} |
| 5 | DD | .~.~.~> Fluid operated {G10B 1/06} |