US PATENT SUBCLASS 381 / 383
.~.~.~.~ Collapsible

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}
374  DF  .~.~.~ Particular support structure {9}
383.~.~.~.~ Collapsible

DEFINITION

Classification: 381/383

Collapsible:

(under subclass 374) Subject matter in which the support structure can be reduced in size for ease of carrying through folding or bending.

SEE OR SEARCH THIS CLASS, SUBCLASS:

379, for adjustable feature in particular support structure.