US PATENT SUBCLASS 381 / 182
.~ Plural or compound reproducers

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.~ Plural or compound reproducers {4}
370  DF  .~.~> Headphone {3}
184  DF  .~.~> Different types of diaphragms
185  DF  .~.~> Having common voice coil
186  DF  .~.~> Plural diaphragms

DEFINITION

Classification: 381/182

Plural or compound reproducers:

(under subclass 180) Subject matter having a plurality of sound producing transducer having two or more elements performing the same or similar functions.