US PATENT SUBCLASS 84 / 50
.~.~.~.~.~ Pneumatic construction

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.~.~.~.~.~ Pneumatic construction {8}
51  DF  .~.~.~.~.~.~> Both primaries and secondaries {1}
53  DF  .~.~.~.~.~.~> Lower leaf moved
54  DF  .~.~.~.~.~.~> Striker pneumatics in wind chest
55  DF  .~.~.~.~.~.~> Units {1}
57  DF  .~.~.~.~.~.~> Tubes and junctions
58  DF  .~.~.~.~.~.~> Bleeds {1}
60  DF  .~.~.~.~.~.~> Valves and seats {2}
64  DF  .~.~.~.~.~.~> Screening and cleaning

DEFINITION

Classification: 84/50

Improvements in the controlling parts between the reservoir and the striker-pneumatics.

(1) Note. Compare this class, subclasses 48, the patents in which are limited to expression mechanism, and 79, which does not include controlling-pneumatics.