| http://www.w3.org/ns/prov#value | - If the effectively usable period does not expire (that is, the effectively usable period is not zero), data which are normally stored in the storage system 53 of the ink cartridge when the ink cartridge is placed in the printer, such as information defining the date and time at which the ink cartridge is placed, i.e. the data on the current time point, information defining how many times the ink c
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