Unit record equipment
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Unit record equipment, electric accounting machines, or tab equipment were electromechanical machines used for performing data processing. Used well before the advent of electronic computers, unit rec
Replica of Hollerith tabulating machine with sorting box, circa 1890. The "sorting box" was an adjunct to, and controlled by, the tabulator. The "sorter", an independent machine, was a later development.
Hollerith machine in use at the London School of Economics in 1964
IBM 029 Card Punch
IBM 082 Sorter
Tabulating machine
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The tabulating machine was an electromechanical machine designed to assist in summarizing information stored on punched cards. Invented by Herman Hollerith, the machine was developed to help process d
Hollerith punched card
IBM Type 285 tabulators in use at U.S. Social Security Administration circa 1936
Early IBM D11 tabulating machine, with covers removed