(under subclass 68) Subject matter wherein a musical instrument playing key (usually an organ key) is linked with the mechanically adjustable or variable part of the resistor to change the resistance value in accordance with the depression of the key.
SEE OR SEARCH THIS CLASS, SUBCLASS:
153, for mechanically variable resistors operated by a pedal or treadle.
SEE OR SEARCH CLASS
84, Music,
1.01+, for electrical tone generation and music instruments with electric translating devices.
