| 984 / | HD | MUSICAL INSTRUMENTS |
|
| 50 | DD | PIANOS {nonmusical aspects of toy pianos A63H 5/00; Aspects of automatic actuation subclasses 200+; Combinations of microphones, pick-ups or amplifiers with musical instruments subclasses 300+} {G10C} {4} |
| 51 |  | .~ General design of pianos or like stringed musical instruments with keyboards {G10C 1/00} {3} |
| 52 | DD | .~.~> Of upright pianos {G10C 1/02} |
| 53 | DD | .~.~> Of grand pianofortes {G10C 1/04} |
| 54 | DD | .~.~> Of cembaloes, spinets, or similar stringed instruments {G10C 1/06} |