US PATENT SUBCLASS 181 / 196
.~ Within tubular means

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
196.~ Within tubular means {1}
197  DF  .~.~> Adjustable

DEFINITION

Classification: 181/196

(under subclass 175) Subject matter wherein a mechanical restriction or valve is located within a sound conducting tubular member.

(1) Note. The structure generally affects the loudness of the sound and/or its quality or tone.

SEE OR SEARCH THIS CLASS, SUBCLASS:

185+, for similar structure within a sound intensifying horn.