> It's great fun. EAN-13 is apparently an "extension" of UPC-A,

Those are used in supermarkets mainly, which is why you find them on all 
products sold to the public.

For non-public uses (eg on shipping cartons, internal parts of products etc) 
the company is obviously free to make up or use their own standard for the 
bar code.  You didn't find any 2D barcodes?

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