Also, "dupes." Reproductions of an original transparency made for the purpose of changing size, ganging, or making additional copies.

Extra copies of stamps that can be sold or traded. Duplicates should be examined carefully for color and perforation variations.

An additional license that a licensee may acquire, if necessary. Duplicates may be for additional rooms, rooms for designated persons, portable bars, controlled access cabinets in hotels, catering permits, events held on property adjacent to the licensed premises, beer manufacturers or wine growers.

Result rows that are identical to one or more other rows.

Two separate samples with separate containers taken at the same time from the same place. This is a quality control method. The two results should be very close.