Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
CPC Main Group
G06K 21/00

Information retrieval from punched cards designed for manual use or handling by machine (G06K19/00 takes precedence; detection or correction of errors by rescanning patterns G06V10/98; checking correct operation of card-conveying mechanisms G06K13/06); Apparatus for handling such cards, e.g. marking or correcting

5 direct subcodes

Child Classifications

Navigate with arrow keys, Enter to open

  • G06K 21/02 in which coincidence of markings is sensed mechanically, e.g. by needle
  • G06K 21/04 in which coincidence of markings is sensed optically, e.g. peek-a-boo system
  • G06K 21/06 Apparatus or tools adapted for slotting or otherwise marking information-retrieval cards