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| An Example of an Application on Punched CardsPunched card machines were used to perform normal commercial and administrative data processing routines as computers do these days. The most significant difference between punched card machines and computers is that one machine could not perform the whole task from beginning to end. One punched card machine could perform only one working phase (duplicating, calculation, interpretation, assorting, printing). After one working phase the cards had to be moved to another machine to perform another working phase. This was redone until the whole assignment was completed. The data was not stored on any hard disk or similar device. The data was stored only on punched cards and more information was added on cards on different working phases. Also the archiving of data was done by punched cards. An example application of electricity invoicing performed by punched cards is shown on the figure below. Mark Sensing cards are used in the application. It is also shown in the figure which punched card machine is commonly used on each working phase.
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