US PATENT SUBCLASS 381 / 325
.~.~ Cerumen protection

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

312  DF  HEARING AIDS, ELECTRICAL {9}
322  DF  .~ Specified casing or housing {8}
325.~.~ Cerumen protection

DEFINITION

Classification: 381/325

Cerumen protection:

(under subclass 322) Subject matter having a barrier or means to prevent the hearing aid from being harmed by earwax.