US PATENT SUBCLASS 84 / 381
.~.~.~ Duplex

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
330  DF  .~ Wind {5}
380 R  DF  .~.~ Wood winds {8}
381.~.~.~ Duplex

DEFINITION

Classification: 84/381

Instruments having two tubes to be blown and fingered simultaneously.