84 / | HD | MUSIC |
1 | DF | INSTRUMENTS {9} |
600 | DF | .~ Electrical musical tone generation {5} |
723 | DF | .~.~ Transducers {9} |
725 | DF | .~.~.~ Electromagnetic {2} |
726 | .~.~.~.~ String {2} | |
727 | DF | .~.~.~.~.~> With adjustable means |
728 | DF | .~.~.~.~.~> Noise reduction (e.g., error prevention) |