US PATENT SUBCLASS 166 / 317
.~ Destructible element

Current as of: June, 1999
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166 /   HD   WELLS

316  DF  VALVES, CLOSURES OR CHANGEABLE RESTRICTORS {5}
317.~ Destructible element

DEFINITION

Classification: 166/317

(under subclass 316) Devices in which there is an element that is destroyed or permanently deformed to allow fluid flow or to stop fluid flow.