Transmit System Character
The first character of UPC-E barcode is the system character
*
Do Not Transmit System
Character
W306A10
Transmit System Character
W306A20
A UPC-E barcode can be augmented with a two-
digit or five-digit add-oncode to form a new one. In
the examples below, the part surrounded by blue
dotted line is a UPC-E barcode while the part circled
by red dotted line is add-on code.
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