US PATENT SUBCLASS 181 / 204
.~.~.~ Internal-combustion engine

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
198  DF  .~ Housing or enclosure (e.g., sound confining and absorbing) {2}
200  DF  .~.~ Machine type enclosure {5}
204.~.~.~ Internal-combustion engine

DEFINITION

Classification: 181/204

Internal-combustion engine:

(under subclass 200) Subject matter wherein the type of machine enclosure is for internal-combustion engines, e.g., automobiles, tractors, lawnmowers, etc.

SEE OR SEARCH CLASS

123, Internal-Combustion Engines, for engines of this subclass type, per se, and in combination with subject matter similar to that of this class (181), note especially

198,.