in the cartridges
The cartridges also contain important information. In addition to the versions and variants of the labels, there are characteristics that must be registered:
Type of circuit cover models
Circuit protection cover with lock.
circuit protection cover without lock.
Without circuit protection cover.
DS (Date Stamp)
On the end label of the cartridges there is a small number engraving, usually above the title, which contains information on the date of manufacture of the cartridge. The information is basically the week and the year of manufacture, some also contain a letter that I have no concrete information about the meaning, just a few suggestions. See the example: