US PATENT SUBCLASS 84 / 31
.~.~.~.~.~ With double tracker

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}
31.~.~.~.~.~ With double tracker {1}
32  DF  .~.~.~.~.~.~> Double length

DEFINITION

Classification: 84/31

The tracker has two sets of rows of note perforations, both normally in use to obtain expression.

(1) Note. Compare this class, subclasses 146, 148 and 152.