Roo's tumblelog

A general scrapbook of ideas, interests and inspirations by roo.
Jun 25
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Seen on a ClearChannel poster: It seems this allows ClearChannel to track when posters have been replaced. (If it’s a Semacode 2D barcode, isn’t it upside down?)
Seen on a ClearChannel poster: It seems this allows ClearChannel to track when posters have been replaced. (If it’s a Semacode 2D barcode, isn’t it upside down?)