US PATENT SUBCLASS 381 / 427
.~.~.~.~ Metal

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}
396  DF  .~ Electromagnetic (e.g., dyynamic) {8}
423  DF  .~.~ Specified diaphragm shape or structure {6}
426  DF  .~.~.~ Critically defined material or lamination {2}
427.~.~.~.~ Metal

DEFINITION

Classification: 381/427

Metal

(under subclass 426) Subject matter in which the particular material is a metallic substance.

SEE OR SEARCH CLASS

181, Acoustics,

168, for metallic material in diaphragm in acoustic devices

generally.