US PATENT SUBCLASS 381 / 371
.~.~.~ Particular cup

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
182  DF  .~ Plural or compound reproducers {4}
370  DF  .~.~ Headphone {3}
371.~.~.~ Particular cup {2}
372  DF  .~.~.~.~> Having mechanical or acoustic sound attenuation
373  DF  .~.~.~.~> Openable to ambient

DEFINITION

Classification: 381/371

Particular cup:

(under subclass 370) Subject matter having particular structural features relating to enclosures designed to fit over or on a user's ear.