US PATENT SUBCLASS 84 / 175
.~.~.~ Duplex

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
173  DF  .~ Stringed {10}
174  DF  .~.~ Pianos {19}
175.~.~.~ Duplex

DEFINITION

Classification: 84/175

Two sets of strings and sometimes two keyboards.