US PATENT SUBCLASS 131 / 223
.~.~ 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}
223.~.~ With valve or external passage closure

DEFINITION

Classification: 131/223

(under subclass 330) Smoking devices provided with a valve in the smoke-conducting passage or having a passage communicating with the smoke-conducting passage in addition to the charge receiving inlet and the mouthpiece outlet, extending to the exterior of the smoking device and having a removable closure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

176, for valved pipe covers.

198.1+, for valved special air inlets.

206, and 215.1+, for other like devices.