Patch Code
Patch Code is a barcode developed by Kodak for use in automated scanning.
A Patch Code consists of two wide bars (0.2 inches (5.1 mm) ± 0.01 inches (0.25 mm)) and two narrow bars (0.08 inches (2.0 mm)). The bars are separated by three narrow spaces, so the Patch Code symbols are a fixed length. There are six distinct permutations of the wide and narrow bars, so there are six Patch Codes. The patches are called: