US PATENT SUBCLASS 84 / 24
.~.~.~.~ Pneumatic type

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.~.~.~.~ Pneumatic type {10}
25  DF  .~.~.~.~.~> Key actuators
26  DF  .~.~.~.~.~> Grands {1}
28  DF  .~.~.~.~.~> Action above keyboard
29  DF  .~.~.~.~.~> Action below keyboard
30  DF  .~.~.~.~.~> Location of parts
31  DF  .~.~.~.~.~> With double tracker {1}
33  DF  .~.~.~.~.~> Expression mechanism {8}
50  DF  .~.~.~.~.~> Pneumatic construction {8}
65  DF  .~.~.~.~.~> Power pneumatics {1}
70  DF  .~.~.~.~.~> Wind-supply devices {3}

DEFINITION

Classification: 84/24

This is the common type of player-piano. The blows are caused by small bellows called "striker-pneumatics", one to each hammer. The patents generally disclose a complete mechanism and often claim details of selecting mechanism as well as the playing mechanism.