US PATENT SUBCLASS 181 / 215
.~.~.~ With adjustable outlet nozzle

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
212  DF  .~ Muffler, fluid conducting type {25}
213  DF  .~.~ Reaction engine type {7}
215.~.~.~ With adjustable outlet nozzle {1}
216  DF  .~.~.~.~> Longitudinally adjustable section

DEFINITION

Classification: 181/215

With adjustable outlet nozzle:

(under subclass 213) Subject matter wherein the shroud is comprised of adjustable tail end sections and the position of the shroud end sections determine the degree of attenuation.