US PATENT SUBCLASS 29 / 888.451
.~.~.~.~ Including forging

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
888  DF  .~ Prime mover or fluid pump making {12}
888.4  DF  .~.~ Poppet or I.C. engine valve or valve seat making {6}
888.45  DF  .~.~.~ Composite or hollow valve stem or head making {3}
888.451.~.~.~.~ Including forging

DEFINITION

Classification: 29/888.451

Including forging:

(under subclass 888.45) Process wherein the manufactured article is shaped or worked by compressive impact force which produces plastic deformation.