US PATENT SUBCLASS 137 / 329.02
.~.~.~ Opposite duplicate surfaces of unitary structure

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

315  DF  WITH REPAIR, TAPPING OR ASSEMBLY MEANS {6}
329  DF  .~ With provision of alternate wear parts {1}
329.01  DF  .~.~ Valve heads and/or seats {3}
329.02.~.~.~ Opposite duplicate surfaces of unitary structure {1}
329.03  DF  .~.~.~.~> Homogeneous material {1}

DEFINITION

Classification: 137/329.02

(under subclass 329.01) Devices having oppositely disposed duplicate surfaces forming a unitary structure.