US PATENT SUBCLASS 220 / 89.3
.~.~.~ With cutting means

Current as of: June, 1999
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220 /   HD   RECEPTACLES

694  DF  CONTAINER ATTACHMENT OR ADJUNCT {21}
89.1  DF  .~ Pressure relief means {2}
89.2  DF  .~.~ Frangible pressure relief means {1}
89.3.~.~.~ With cutting means

DEFINITION

Classification: 220/89.3

With cutting means:

(under subclass 89.2) Receptacle including an additional member having a knife edge or point intended to facilitate the bursting of the diaphragm.