Lace card
A lace card (also called a whoopee card, ventilator card, flyswatter card, or IBM doily) is a punched card with all holes punched. They were mainly used as practical jokes to cause disruption in card readers.
A lace card (also called a whoopee card, ventilator card, flyswatter card, or IBM doily) is a punched card with all holes punched. They were mainly used as practical jokes to cause disruption in card readers.
A lace card (also called a whoopee card, ventilator card, flyswatter card, or IBM doily) is a punched card with all holes punched. They were mainly used as practical jokes to cause disruption in card readers.
Source: Wikipedia "Lace card" · CC BY-SA 4.0
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