US PATENT SUBCLASS 164 / 245
.~.~ To produce undercut

Current as of: June, 1999
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164 /   HD   METAL FOUNDING

159  DF  MEANS TO SHAPE A FORMING SURFACE {8}
235  DF  .~ Pattern {6}
245.~.~ To produce undercut {3}
246  DF  .~.~.~> Destructible type pattern
247  DF  .~.~.~> Rotatable or pivotal pattern or pattern section
248  DF  .~.~.~> Loose piece type

DEFINITION

Classification: 164/245

(under subclass 235) Apparatus wherein the pattern means is particularly adapted for producing undercut parts in the mold.