US PATENT SUBCLASS 131 / 206
.~.~.~.~.~.~ With valve or external passage closure

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}
200  DF  .~.~ Smoke treating {1}
201  DF  .~.~.~ Material separator and trap {7}
202  DF  .~.~.~.~ Filter and/or absorber {3}
205  DF  .~.~.~.~.~ Tobacco supports {1}
206.~.~.~.~.~.~ With valve or external passage closure

DEFINITION

Classification: 131/206

(under subclass 205) Smoking devices which are also provided with a valve in the smoke- conducting passage or with a passage communicating with the smoke-conducting passage in addition to the charge inserting opening or the mouthpiece outlet, extending to the exterior of the smoking device and having a removable closure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

215.1+, and 223, for other smoking devices having a valve or external passage closure.