US PATENT SUBCLASS 84 / 640
.~.~.~.~ Variable speed

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
600  DF  .~ Electrical musical tone generation {5}
601  DF  .~.~ Data storage {6}
639  DF  .~.~.~ Photoelectric {1}
640.~.~.~.~ Variable speed

DEFINITION

Classification: 84/640

Variable speed:

(under subclass 639) Subject matter wherein different pitches are obtained by varying the rotational speed of a diffraction or grating disk.

SEE OR SEARCH CLASS

250, Radiant Energy,

237+, for pre-photocell grating systems.

359, Optics: Systems (Including Communication) and Elements,

558+, for optical diffraction devices.