| 1 | These books have been bar-coded. | |
| 2 | With a bit of skill, the barcode can disappear entirely. | |
| 3 | The first product to have a bar code was Wrigleys gum. | |
| 4 | The institute is considering creating a digital version using a form of bar code. | |
| 5 | These contain far more information than bar codes and can be scanned remotely. |