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PCE
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DIFF Subgroup
G06K 21/04

in which coincidence of markings is sensed optically, e.g. peek-a-boo system

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Information retrieval from punched cards designed for manual use or handling by machine; Apparatus for handling such cards, e.g. marking or correcting > in which coincidence of markings is sensed optically, e.g. peek-a-boo system

CPC:

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 > in which coincidence of markings is sensed optically, e.g. peek-a-boo system

No child classifications to compare. This is a leaf node in both IPC and CPC.