collating aperture

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Unit record equipment — Before the advent of electronic computers, data processing was performed using electromechanical devices called unit record equipment, electric accounting machines (EAM) or tabulating machines. Unit record machines were as ubiquitous in industry… … Wikipedia
Letter box — This article is about boxes for depositing letters. For video framing, see letterbox. For the type of interprocess communication, see MailSlot . A letter box, letterbox, letter plate, letter hole, mail slot, or mailbox is a receptacle for… … Wikipedia

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