US PATENT SUBCLASS 84 / 480
.~.~.~.~.~ With transposing slide

Current as of: June, 1999
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84 /   HD   MUSIC

453  DF  ACCESSORIES {6}
470 R  DF  .~ Teaching devices {4}
477 R  DF  .~.~ Indicators {5}
478  DF  .~.~.~ For keyboard {2}
479 R  DF  .~.~.~.~ Single position {3}
480.~.~.~.~.~ With transposing slide

DEFINITION

Classification: 84/480

The card has a slide to indicate various major or minor keys.