US PATENT SUBCLASS 131 / 217
.~.~.~ Spiral passage

Current as of: June, 1999
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131 /   HD   TOBACCO

329  DF  TOBACCO USERS' APPLIANCE {8}
330  DF  .~ Device used for smoking {21}
216  DF  .~.~ Special smoke passages {2}
217.~.~.~ Spiral passage

DEFINITION

Classification: 131/217

(under subclass 216) Smoking devices in which the smoke passage or some part thereof is of spiral formation.

(1) Note. Compare this class, subclasses 209 and 339.

SEE OR SEARCH THIS CLASS, SUBCLASS:

198.1+, for special air inlets to the smoke passage.