US PATENT SUBCLASS 84 / 51
.~.~.~.~.~.~ Both primaries and secondaries

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
*  DD  .~ Automatic {13}
7  DF  .~.~ Stringed {4}
13  DF  .~.~.~ Pianos {5}
24  DF  .~.~.~.~ Pneumatic type {10}
50  DF  .~.~.~.~.~ Pneumatic construction {8}
51.~.~.~.~.~.~ Both primaries and secondaries {1}
52  DF  .~.~.~.~.~.~.~> Lower leaf moved

DEFINITION

Classification: 84/51

The pneumatic train includes both primary and secondary valves, sometimes called the "double-valve system".