(under the class definition) Apparatus in which one of the pressure surfaces has a projection on it which is received within a cavity in the other pressure surface, the material compacted being contained within and lining the cavity and surrounding the projection.
SEE OR SEARCH CLASS
72, Metal Deforming,
343+, for a reciprocating die press for deep drawing or forging a metal workpiece between a male die and a closed periphery female die.
