US PATENT SUBCLASS 84 / 427
.~.~.~ Plurality of touch plates

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
*  DD  .~ General features {7}
423 R  DF  .~.~ Keyboards {12}
427.~.~.~ Plurality of touch plates {1}
428  DF  .~.~.~.~> Whole-tone scale

DEFINITION

Classification: 84/427

All or some of the keys have two places for fingering; stepped keys.