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Terminology Description
Latent Image Edge Numbering

One of two ways which Kodak places edge numbers on its camera film (the other being visible ink edge numbering), in which the film edge is exposed by a printer mounted at the perforator to produce an image visible only when the film is processed.  In addition to the edge numbers, also included are a manufacturer's code for the type of film, the perforator, and the equipment used to produce the product