US PATENT SUBCLASS 137 / 69
.~.~ With counterbalancing element


Current as of: June, 1999
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137 /   HD   FLUID HANDLING

67  DF  DESTRUCTIBLE OR DEFORMABLE ELEMENT CONTROLLED {2}
68.11  DF  .~ Destructible element {9}
69.~.~ With counterbalancing element


DEFINITION

Classification: 137/69

With counterbalancing element:

(under subclass 68.12) Apparatus which includes means for applying a force or bias to the frangible means in a direction opposing the force (usually fluid pressure) which tends to break the frangible element.