The next design by the Rittys, and the first to be marketed,  was the ‘Paper Roll’ machine. This machine was a complete rethink on the original idea. The adding counter, used in the 1879 Patent Register was dispensed with being replaced by a roll of paper which  had a hole punched in the appropriate column by  depression of an amount key. The clock dial was replaced with a flag or tablet which was raised, by the key, into position in the window to indicate the value of the sale.
At the end of the day the store owner was obliged to count the number of holes in each column multiplying  that be the value of the corresponding key before adding all the totals together. Although this was a time consuming task the paper roll contained a record of all the sales made during the day.

The first model of this type did not have a cash drawer but did have a bell to indicate as describe in the patent that it“gives notice to the customer that the machine has been properly operated”. A secondary benefit was that the store owner, perhaps in another part of the shop, also knew that a sale was being recorded by an assistant.

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Detail Adder
The keys on the keyboard were arranged in two banks to allow for twenty keys with a  keytop of about ¾  of an inch to be fitted across the register. The amounts on the keyboard being arranged with the lowest value on the left and the highest denomination on the right.