US PATENT SUBCLASS 84 / 43
.~.~.~.~.~.~.~ By use of two pressures


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
*  DD  .~ Automatic {13}
7  DF  .~.~ Stringed {4}
13  DF  .~.~.~ Pianos {5}
24  DF  .~.~.~.~ Pneumatic type {10}
33  DF  .~.~.~.~.~ Expression mechanism {8}
39  DF  .~.~.~.~.~.~ Wind pressure varied {4}
43.~.~.~.~.~.~.~ By use of two pressures


DEFINITION

Classification: 84/43

The variation is due to the alternate use of two wind-chambers holding air, respectively, at high and low tension.