US PATENT SUBCLASS 84 / 152
.~.~.~.~ Double scale

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
*  DD  .~ Automatic {13}
115  DF  .~.~ Selectors {8}
151  DF  .~.~.~ Trackers {6}
152.~.~.~.~ Double scale {1}
153  DF  .~.~.~.~.~> Trackers rigidly connected {2}

DEFINITION

Classification: 84/152

Especially to allow the use of sixty-five or eighty-eight note-sheets at will. There are covers or other means to close either set of ducts.

(1) Note. In the trackers of subclass 31 both rows are in use together.