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Loose Piece

1) Core box: part of the core box which remains embedded in the core and is removed after lifting off the core box. 2) Pattern: laterally projecting part of a pattern so attached that it remains in the mold until the body of the pattern is drawn. Back draft is avoided by this means. 3) Permanent mold: part which remains on the casting and is removed after the casting is ejected from the mold.