US PATENT SUBCLASS 84 / 391
.~.~.~.~ Helical or sliding movement

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}
391.~.~.~.~ Helical or sliding movement

DEFINITION

Classification: 84/391

The valves have a combined rotating and sliding movement or the engaging surfaces of the valve and its seat are planes.