(57) This electronic cash register includes a means for counting the current time, a means
for maintaining a management table in which is stored management data information
such as data regarding unit numbers and prices and data relating to messages to be
printed on receipts to be given to the customer, a means for storing modification
data for the management data stored in the management table and also for storing the
associated implementation time therefor, a means for inputting the modification data
and the implementation time therefor, and a means for modifying the management data
stored in the management table according to the modification data when the implementation
time for implementing such modification data has arrived, as determined by the time
counting means. Thereby, data for modification of the management data can be input
in advance and such modifications can be implemented automatically when the appropriate
time arrives. Thereby mental and physical strain on the operator of the electronic
cash register are avoided, and the problem of implementing a large number of modifications
of management data in a short time is also obviated. I
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