Bar code A series of vertical full bars and half bars representing the ZIP Code information printed on a mail piece to facilitate automated processing by bar code reader equipment.
Place bar codes in bound periodicals
Sort periodical & auction catalogues*
Label and shift books ...
Four State Bar Code: each bar in the 31-digit code cane be in one of the four different shapes or sizes.
Fourth Bureau Issue: series of stamps issued in 1922, includes sheets, coils and booklets.
Fourth Class Mail: includes U.S.
IBI uses a two-dimensional bar code (Datamatrix or PDF417) to encode the originating address, date of mailing, postage and a digital signature to verify the stamp.[18] ...
Universal Product Code bar codes are among the latest marginal markings on U.S. stamps, as stamp sales become fully automated.
In the Postal Service, Optical Character Readers are used to read mail addresses and spray corresponding bar codes onto the envelopes for processing. The first postal OCR was used in the Detroit post office in 1965.
Optical Character Reader - postal equipment that "reads" the address on an envelope. Sometimes this term is also used for the entire system, including the device that sprays the address on the envelope as a bar code.
Some countries have issued registered mail stamps. There used to be quite a system in place for registered Australian mail but with the advent of computers and the proliferation of bar codes, those days are (some would say ‘sadly’) gone.
 See also: Stamp, Catalog, Used, Printing, Catalogue
  
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