| 84 / | HD | MUSIC |
| 1 | DF | INSTRUMENTS {9} |
| 173 | DF | .~ Stringed {10} |
| 174 | DF | .~.~ Pianos {19} |
| 236 | DF | .~.~.~ Hammers actions {3} |
| 243 | | .~.~.~.~ Details {9} |
| 244 | DF | .~.~.~.~.~> Power-operated hammers {2} |
| 247 | DF | .~.~.~.~.~> Jack constantly controlled |
| 248 | DF | .~.~.~.~.~> Inverted jack |
| 249 | DF | .~.~.~.~.~> Jointed jack |
| 250 | DF | .~.~.~.~.~> Action frames |
| 251 | DF | .~.~.~.~.~> Flanges and joints {1} |
| 253 | DF | .~.~.~.~.~> Checks |
| 254 | DF | .~.~.~.~.~> Hammer heads |
| 255 | DF | .~.~.~.~.~> Damper heads and stems |