US PATENT SUBCLASS 84 / 473
.~.~.~ 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}
471 R  DF  .~.~ Charts or boards {5}
473.~.~.~ With transposing slide

DEFINITION

Classification: 84/473

Devices having a slide for illustrating change of key.