US PATENT SUBCLASS 381 / 338
.~.~ With tubular waveguide or resonant element

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}
337  DF  .~ Having acoustic wave modifying structure {5}
338.~.~ With tubular waveguide or resonant element

DEFINITION

Classification: 381/338

With tubular waveguide or resonant element:

(under subclass 337) Subject matter for conducting sound through either a) a hollow cylinder or b) one or more hollow, acoustically resonant means, such as a hollow reed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

382, for sound conducting tube in a particular support structure.

SEE OR SEARCH CLASS

181, Acoustics,

196+, for a mechanical acoustic sound modifying means within tubular means.