US PATENT SUBCLASS 137 / 329.01
.~.~ Valve heads and/or seats


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.~.~ Valve heads and/or seats {3}
329.02  DF  .~.~.~> Opposite duplicate surfaces of unitary structure {1}
329.05  DF  .~.~.~> Different portions of continuous surfaces
329.06  DF  .~.~.~> Successively used adjacent independent elements


DEFINITION

Classification: 137/329.01

(under subclass 329) Devices relating to valve heads and/or seats.