(under the class definition) Molding apparatus wherein either
all or a portion of the molding apparatus is composed of material which is chemically or physically altered during the molding operation, or after the molding operation, for facilitating the separation of the product from said molding apparatus.
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54, for dental type molding apparatus which is usually destructible.
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264, Plastic and Nonmetallic Article Shaping or Treating: Processes,
221, for process having a step of mold making or mold shaping, per se, wherein the pattern or mold is destroyed.