US PATENT SUBCLASS 451 / 252
.~.~.~.~.~ Valve abrader

Current as of: June, 1999
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451 /   HD   ABRADING

64  DF  MACHINE {12}
177  DF  .~ Rotary tool {3}
178  DF  .~.~ Rotary cylinder {11}
242  DF  .~.~.~ Work rotating {5}
246  DF  .~.~.~.~ Rotary work holder {9}
252.~.~.~.~.~ Valve abrader

DEFINITION

Classification: 451/252

Valve abrader:

(under subclass 246) Abrading machine particularly adapted to grind a sealing surface of a member intended to be used to contain and adjustably restrict the flow of fluid.