The bar code is on the back panel of the refrigerator, with 20 digits, the seventh from the bottom is the year of production, the sixth from the bottom is the month, and the fifth from the bottom is the day. The date starting from 1-9 stands for 1-9, and starting from 10, it is represented by a, and 1 1 stands for b, and the English letter o is removed from it.

The refrigerator shown below was produced on September 19, 2008. The penultimate year is the year of manufacture; The sixth from the bottom is the month.

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Barcodes are divided into three types: one-dimensional barcode, two-dimensional barcode and color barcode.

1, one-dimensional barcode

One-dimensional bar code only expresses information in one direction (generally horizontal direction), and does not express any information in the vertical direction. Its height is usually for the convenience of readers' alignment.

2, two-dimensional bar code

Barcodes that store information in two-dimensional space in horizontal and vertical directions are called two-dimensional barcodes.

Like one-dimensional bar code, two-dimensional bar code has many different coding methods, or coding systems. As far as the coding principles of these codes are concerned, they can usually be divided into the following three types.