US PATENT SUBCLASS 84 / 160
.~.~.~.~ Pneumato-electric

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
*  DD  .~ Automatic {13}
115  DF  .~.~ Selectors {8}
151  DF  .~.~.~ Trackers {6}
160.~.~.~.~ Pneumato-electric

DEFINITION

Classification: 84/160

The tracker-bar has ducts admitting air to pouches or small bellows that operate electric switches.