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lace card

   (also called a `whoopee card' or `ventilator card').  Card
   readers tended to jam when they got to one of these, as the
   resulting card had too little structural strength to avoid buckling
   inside the mechanism.  Card punches could also jam trying to
   produce these things owing to power-supply problems.  When some
   practical joker fed a lace card through the reader, you needed to
   clear the jam with a `card knife' --- which you used on the joker
   first.