US PATENT SUBCLASS 381 / FOR 137
.~.~ Having battery (381/69.2)

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

FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 135  DF  .~ Specified casing or housing (381/69) {2}
FOR 137.~.~ Having battery (381/69.2)

DEFINITION

Classification: 381/FOR.137

Having battery:

Subject matter including at least one battery used as a power source.