Unit record equipment

• abstract: Starting at the end of the nineteenth century, well before the advent of electronic computers, data processing was performed using electromechanical devices called unit recordIn the late 1800s, early 1900s unit record was a reference to the recording of all information about a transaction or object on one document. At that time the library index card was pointed out as an early example of a unit record.

以上来源于: WordNet