US PATENT SUBCLASS 84 / 393
.~.~.~.~ With substitute tubes

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
330  DF  .~ Wind {5}
387 R  DF  .~.~ Brasses {7}
388  DF  .~.~.~ Valve type {6}
393.~.~.~.~ With substitute tubes

DEFINITION

Classification: 84/393

Each valve controls two tubes of different length, often symmetrically placed, whereby the difference in timbre between open and valve tones is diminished.