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Because punched card readers scan uniform rectangular holes in a precise arrangement, any damage to the physical card makes it unusable. In the 1950s and 1960s, when the use of punch cards became widespread, manufacturers printed a warning on each card reading "Do not fold, spindle or mutilate".
(An alternative, imperfect but commonly employed technique to maintain proper card order was to draw one or more diagonal stripes across the top edge of all the cards in a deck.) In later years, as punch card data was converted to magnetic tape files the sequence numbers were often used as a column in an array as an index value that can be ...
Cards would typically be punched with some initial information, such as the name and location of an inventory item. Information to be added, such as quantity of the item on hand, would be marked in the ovals. Card punches with an option to detect mark sense cards could then punch the corresponding information into the card.
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The set's entire second series (the 87 cards numbered 110 through 196) was first printed and distributed without the proper amount of ink for the photographs; the result has been known ever since as the "Green Tint" series, for the sky and dirt in the backgrounds of some cards are decidedly green, rather than blue or brown. [2]
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