| | slovo | definícia |  | ventilator card (foldoc)
 | lace card ventilator card
 
 (Obsolete) A punched card with all holes punched (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.
 
 [Jargon File]
 
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