US PATENT SUBCLASS 381 / 411
.~.~ Including adjustment mechanism

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}
411.~.~ Including adjustment mechanism

DEFINITION

Classification: 381/411

Including adjustment mechanism:

(under subclass 396) Subject matter including means to alter some aspect or physical parameter of the electromagnetic transducer, such as the air gap size.