Some s students at Berkeley wore buttons saying: "Do not fold, spindle or mutilate. Security checks issued starting in Hollerith's original system used an ad-hoc coding system for each application, with groups of holes assigned specific meanings, e. Long cards were available with a scored stub on either end which, when torn off, left an 80 column card. The even numbers in a pair are formed by combining that punch with a 9 punch. Computing before Computers. The Hollerith punched cards used for the US census were blank. Wikimedia Commons has media related to Punch card.