US PATENT SUBCLASS 220 / 227
.~.~ With vent means

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
216  DF  .~ Floating closure {6}
227.~.~ With vent means

DEFINITION

Classification: 220/227

(under subclass 216) Device wherein the closure means is provided with an opening for the escape of gas from the receptacle which it closes.