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== Phantom parts ==
The term '''phantom part''' is sometimes used to describe a series of parts that collectively make up an assembly or subassembly. This concept is helpful in the [[database management]] of engineering and production (such as in [[product data management]] applications) when it is useful to think of a certain combination of subparts as "one part" (and thus one [[row (database)|database record]]) for ordering, production, or billing purposes.