US PATENT SUBCLASS 381 / 373
.~.~.~.~ Openable to ambient

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  DF  .~.~.~ Particular cup {2}
373.~.~.~.~ Openable to ambient

DEFINITION

Classification: 381/373

Openable to ambient:

(under subclass 371) Subject matter in which the space within the cup is ventable to the atmosphere.