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Back of letter
The backs of letters have a similar barcode on them in the lower-left corner, usually with wider-width bars. These do not co-ordinate with the symbology used on the front of the letter. Anyone know what this barcode is for? -- Mozillaman ( talk) 13:06, 5 December 2008 (UTC)
- That's a serial number that is put on the back of an envelope when it is put on "hold" after the MLOCR finds the address on the front of the envelope unreadable. -- Denelson 83 19:45, 5 December 2008 (UTC)