The mold is produced from a pattern; in some processes, such as sand and shell casting, the mold is.

The mold is
produced from a pattern; in some processes, such as sand and shell casting, the
mold is expendable, but the pattern is reused to produce several molds. Such
processes are referred to as expendable-mold, permanent-pattern casting
processes.

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The mold is produced from a pattern; in some processes, such as sand and shell casting, the mold is.
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