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2. Code 39 - Wikipedia

   en.wikipedia.org/wiki/Code_39

   The barcode scheme does not contain a check digit (in contrast to—for instance—Code 128), but it can be considered self-checking on the grounds that a single erroneously interpreted bar cannot generate another valid character. Possibly the most serious drawback of Code 39 is its low data density: It requires more space to encode data in ...

3. Code 128 - Wikipedia

   en.wikipedia.org/wiki/Code_128

   The 128 code – Learn the Code 128 encoding algorithm with a font-based barcode solution. Online barcode generator – Free online Barcode generator for the various barcode types. Barcode types in an overview - Common 1D & 2D barcode types in an overview; Online Barcode Generator - Free online barcode generator, 1D and 2D.

4. GS1 - Wikipedia

   en.wikipedia.org/wiki/GS1

   GS1 introduced the barcode in 1974. [8] A barcode encodes a product identification number that can be scanned electronically, making it easier for products to be tracked, processed, and stored. Barcodes improve the efficiency, safety, speed and visibility of supply chains across physical and digital channels.

5. List of GS1 country codes - Wikipedia

   en.wikipedia.org/wiki/List_of_GS1_country_codes

   "Bookland" – 979-0 used for sheet music ("Musicland", ISMN-13, replaces deprecated ISMN M- numbers) 980: Refund receipts 981–983: GS1 coupon identification for common currency areas 990–999: GS1 coupon identification

6. Barcode library - Wikipedia

   en.wikipedia.org/wiki/Barcode_library

   Barcode library or Barcode SDK is a software library that can be used to add barcode features to desktop, web, mobile or embedded applications. Barcode library presents sets of subroutines or objects which allow to create barcode images and put them on surfaces or recognize machine-encoded text / data from scanned or captured by camera images with embedded barcodes.

7. Barcode - Wikipedia

   en.wikipedia.org/wiki/Barcode

   The earliest, and still [when?] the cheapest, barcode scanners are built from a fixed light and a single photosensor that is manually moved across the barcode. Barcode scanners can be classified into three categories based on their connection to the computer. The older type is the RS-232 barcode scanner. This type requires special programming ...