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Codabar is a binary level barcode originally developed
by Monarch Marking in 1972. It is also called NW-7 because
all Codabar characters are constructed from four bars
and the three intervening spaces. It is a self-checking,
discrete symbology having 16 characters in its set:
the numbers 0 to 9, and the $ : / . + - characters.
There are four different start/stop characters A, B,
C, and D that are generally used in matching pairs and
may not appear elsewhere in the barcode. Codabar is
used in libraries, blood banks, membership cards, the
overnight package delivery industry, and a variety of
information processing applications.
The numeric characters each have one wide bar and one
wide space within the group of four bars and three spaces.
The alpha start/stop characters are constructed with
one wide bar and two wide spaces. Quiet zone is 10 times
width of narrow bar. There is no checksum defined as
part of the Codabar standard. But when it is used, it
is inserted between the last data character and stop
character. Modulus 16 is generally used for the checksum.
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